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Friday, March 15, 2024

Hydrogen fluoride

From Wikipedia, the free encyclopedia
Hydrogen fluoride
Names
Other names
Fluorane
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.028.759 Edit this at Wikidata
KEGG
RTECS number
  • MW7875000
UNII
UN number 1052


Properties
HF
Molar mass 20.006 g·mol−1
Appearance colourless gas or colourless liquid (below 19.5 °C)
Odor unpleasant
Density 1.15 g/L, gas (25 °C)
0.99 g/mL, liquid (19.5 °C)
1.663 g/mL, solid (–125 °C)
Melting point −83.6 °C (−118.5 °F; 189.6 K)
Boiling point 19.5 °C (67.1 °F; 292.6 K)
completely miscible (liquid)
Vapor pressure 783 mmHg (20 °C)
Acidity (pKa) 3.17 (in water),

15 (in DMSO) 

Conjugate acid Fluoronium
Conjugate base Fluoride
1.00001
Structure
Linear
1.86 D
Thermochemistry
8.687 J/g K (gas)
−13.66 kJ/g (gas)
−14.99 kJ/g (liquid)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Highly toxic, corrosive, irritant
GHS labelling:
GHS05: Corrosive GHS06: ToxicGHS07: Exclamation mark
Danger
H300+H310+H330, H314
P260, P262, P264, P270, P271, P280, P284, P301+P310, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P322, P330, P361, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)
Flash point none
Lethal dose or concentration (LD, LC):
17 ppm (rat, oral)
1276 ppm (rat, 1 hr)
1774 ppm (monkey, 1 hr)
4327 ppm (guinea pig, 15 min)
313 ppm (rabbit, 7 hr)
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 3 ppm
REL (Recommended)
TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute]
IDLH (Immediate danger)
30 ppm
Related compounds
Other anions
Hydrogen chloride
Hydrogen bromide
Hydrogen iodide
Hydrogen astatide
Other cations
Sodium fluoride
Potassium fluoride
Rubidium fluoride
Caesium fluoride
Related compounds
Water
Ammonia
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydrogen fluoride (fluorane) is an inorganic compound with chemical formula HF. It is a very poisonous, colorless gas or liquid that dissolves in water to yield an aqueous solution termed hydrofluoric acid. It is the principal industrial source of fluorine, often in the form of hydrofluoric acid, and is an important feedstock in the preparation of many important compounds including pharmaceuticals and polymers, e.g. polytetrafluoroethylene (PTFE). HF is also widely used in the petrochemical industry as a component of superacids. Due to strong and extensive hydrogen bonding, it boils at near room temperature, much higher than other hydrogen halides.

Hydrogen fluoride is an extremely dangerous gas, forming corrosive and penetrating hydrofluoric acid upon contact with moisture. The gas can also cause blindness by rapid destruction of the corneas.

History

In 1771 Carl Wilhelm Scheele prepared the aqueous solution, hydrofluoric acid in large quantities, although hydrofluoric acid had been known in the glass industry before then. French chemist Edmond Frémy (1814–1894) is credited with discovering hydrogen fluoride (HF) while trying to isolate fluorine.

Structure and reactions

The structure of chains of HF in crystalline hydrogen fluoride.

HF is diatomic in the gas-phase. As a liquid, HF forms relatively strong hydrogen bonds, hence its relatively high boiling point. Solid HF consists of zig-zag chains of HF molecules. The HF molecules, with a short covalent H–F bond of 95 pm length, are linked to neighboring molecules by intermolecular H–F distances of 155 pm. Liquid HF also consists of chains of HF molecules, but the chains are shorter, consisting on average of only five or six molecules.

Comparison with other hydrogen halides

Hydrogen fluoride does not boil until 20 °C in contrast to the heavier hydrogen halides, which boil between −85 °C (−120 °F) and −35 °C (−30 °F). This hydrogen bonding between HF molecules gives rise to high viscosity in the liquid phase and lower than expected pressure in the gas phase.

Aqueous solutions

HF is miscible with water (dissolves in any proportion). In contrast, the other hydrogen halides exhibit limiting solubilities in water. Hydrogen fluoride forms a monohydrate HF.H2O with melting point −40 °C (−40 °F), which is 44 °C (79 °F) above the melting point of pure HF.

HF and H2O similarities
graph showing trend-breaking water and HF boiling points: big jogs up versus a trend that is down with lower molecular weight for the other series members. graph showing humps of melting temperature, most prominent is at HF 50% mole fraction
Boiling points of the hydrogen halides (blue) and hydrogen chalcogenides (red): HF and H2O break trends. Freezing point of HF/ H2O mixtures: arrows indicate compounds in the solid state.

Aqueous solutions of HF are called hydrofluoric acid. When dilute, hydrofluoric acid behaves like a weak acid, unlike the other hydrohalic acids, due to the formation of hydrogen-bonded ion pairs [H3O+·F]. However concentrated solutions are strong acids, because bifluoride anions are predominant, instead of ion pairs. In liquid anhydrous HF, self-ionization occurs:

3 HF ⇌ H2F+ + HF2

which forms an extremely acidic liquid (H0 = −15.1).

Reactions with Lewis acids

Like water, HF can act as a weak base, reacting with Lewis acids to give superacids. A Hammett acidity function (H0) of −21 is obtained with antimony pentafluoride (SbF5), forming fluoroantimonic acid.

Production

Hydrogen fluoride is typically produced by the reaction between sulfuric acid and pure grades of the mineral fluorite:

CaF2 + H2SO4 → 2 HF + CaSO4

About 20% of manufactured HF is a byproduct of fertilizer production, which generates hexafluorosilicic acid. This acid can be degraded to release HF thermally and by hydrolysis:

H2SiF6 → 2 HF + SiF4
SiF4 + 2 H2O → 4 HF + SiO2

Use

In general, anhydrous hydrogen fluoride is more common industrially than its aqueous solution, hydrofluoric acid. Its main uses, on a tonnage basis, are as a precursor to organofluorine compounds and a precursor to cryolite for the electrolysis of aluminium.

Precursor to organofluorine compounds

HF reacts with chlorocarbons to give fluorocarbons. An important application of this reaction is the production of tetrafluoroethylene (TFE), precursor to Teflon. Chloroform is fluorinated by HF to produce chlorodifluoromethane (R-22):

CHCl3 + 2 HF → CHClF2 + 2 HCl

Pyrolysis of chlorodifluoromethane (at 550-750 °C) yields TFE.

HF is a reactive solvent in the electrochemical fluorination of organic compounds. In this approach, HF is oxidized in the presence of a hydrocarbon and the fluorine replaces C–H bonds with C–F bonds. Perfluorinated carboxylic acids and sulfonic acids are produced in this way.

1,1-Difluoroethane is produced by adding HF to acetylene using mercury as a catalyst.

HC≡CH + 2 HF → CH3CHF2

The intermediate in this process is vinyl fluoride or fluoroethylene, the monomeric precursor to polyvinyl fluoride.

Precursor to metal fluorides and fluorine

The electrowinning of aluminium relies on the electrolysis of aluminium fluoride in molten cryolite. Several kilograms of HF are consumed per ton of Al produced. Other metal fluorides are produced using HF, including uranium tetrafluoride.

HF is the precursor to elemental fluorine, F2, by electrolysis of a solution of HF and potassium bifluoride. The potassium bifluoride is needed because anhydrous HF does not conduct electricity. Several thousand tons of F2 are produced annually.

Catalyst

HF serves as a catalyst in alkylation processes in refineries. It is used in the majority of the installed linear alkyl benzene production facilities in the world. The process involves dehydrogenation of n-paraffins to olefins, and subsequent reaction with benzene using HF as catalyst. For example, in oil refineries "alkylate", a component of high-octane petrol (gasoline), is generated in alkylation units, which combine C3 and C4 olefins and iso-butane.

Solvent

Hydrogen fluoride is an excellent solvent. Reflecting the ability of HF to participate in hydrogen bonding, even proteins and carbohydrates dissolve in HF and can be recovered from it. In contrast, most non-fluoride inorganic chemicals react with HF rather than dissolving.

Health effects

left and right hands, two views, burned index fingers
HF burns, not evident until a day after

Hydrogen fluoride is highly corrosive and a powerful contact poison. Exposure requires immediate medical attention. It can cause blindness by rapid destruction of the corneas. Breathing in hydrogen fluoride at high levels or in combination with skin contact can cause death from an irregular heartbeat or from pulmonary edema (fluid buildup in the lungs).

Elie Wiesel

From Wikipedia, the free encyclopedia
 
Elie Wiesel
Wiesel in 1996
Wiesel in 1996
BornEliezer Wiesel
September 30, 1928
Sighet, Kingdom of Romania
DiedJuly 2, 2016 (aged 87)
New York City, U.S.
Occupation
  • Author
  • professor
  • activist
  • journalist
Citizenship
Alma materUniversity of Paris
Subjects
Notable worksNight (1960)
Notable awards
Spouse
Marion Erster Rose
(m. 1969)
ChildrenElisha

Eliezer "Elie" Wiesel (/ˈɛli vˈzɛl/ EL-ee vee-ZEL or /ˈl ˈvsəl/ EE-ly VEE-səl; Yiddish: אליעזר "אלי" װיזעל, romanizedEliezer "Eli" Vizel; September 30, 1928 – July 2, 2016) was a Romanian-born American writer, professor, political activist, Nobel laureate, and Holocaust survivor. He authored 57 books, written mostly in French and English, including Night, a work based on his experiences as a Jewish prisoner in the Auschwitz and Buchenwald concentration camps.

In his political activities Wiesel became a regular speaker on the subject of the Holocaust and remained a strong defender of human rights during his lifetime. He also advocated for many other causes like the state of Israel and against Hamas and victims of oppression including Soviet and Ethiopian Jews, the apartheid in South Africa, the Bosnian genocide, Sudan, the Kurds and the Armenian genocide, Argentina's Desaparecidos or Nicaragua's Miskito people.

He was a professor of the humanities at Boston University, which created the Elie Wiesel Center for Jewish Studies in his honor. He was involved with Jewish causes and human rights causes and helped establish the United States Holocaust Memorial Museum in Washington, D.C.

Wiesel was awarded various prestigious awards including the Nobel Peace Prize in 1986. He was a founding board member of the New York Human Rights Foundation and remained active in it throughout his life.Early life

The house in which Wiesel was born in Sighet

Eliezer Wiesel was born in Sighet (now Sighetu Marmației), Maramureș, in the Carpathian Mountains of Romania. His parents were Sarah Feig and Shlomo Wiesel. At home, Wiesel's family spoke Yiddish most of the time, but also German, Hungarian, and Romanian. Wiesel's mother, Sarah, was the daughter of Dodye Feig, a Vizhnitz Hasid and farmer from the nearby village of Bocskó. Dodye was active and trusted within the community.

Wiesel's father, Shlomo, instilled a strong sense of humanism in his son, encouraging him to learn Hebrew and to read literature, whereas his mother encouraged him to study the Torah. Wiesel said his father represented reason, while his mother Sarah promoted faith. Wiesel was instructed that his genealogy traced back to Rabbi Schlomo Yitzhaki (Rashi), and was a descendant of Rabbi Yeshayahu ben Abraham Horovitz ha-Levi.

Wiesel had three siblings—older sisters Beatrice and Hilda, and younger sister Tzipora. Beatrice and Hilda survived the war, and were reunited with Wiesel at a French orphanage. They eventually emigrated to North America, with Beatrice moving to Montreal, Quebec, Canada. Tzipora, Shlomo, and Sarah did not survive the Holocaust.

Imprisonment and orphaning during the Holocaust

Buchenwald concentration camp, photo taken April 16, 1945, five days after liberation of the camp. Wiesel is in the second row from the bottom, seventh from the left, next to the bunk post.

In March 1944, Germany occupied Hungary, thus extending the Holocaust into Northern Transylvania as well. Wiesel was 15, and he, with his family, along with the rest of the town's Jewish population, was placed in one of the two confinement ghettos set up in Máramarossziget (Sighet), the town where he had been born and raised. In May 1944, the Hungarian authorities, under German pressure, began to deport the Jewish community to the Auschwitz concentration camp, where up to 90 percent of the people were murdered on arrival.

Immediately after they were sent to Auschwitz, his mother and his younger sister were murdered. Wiesel and his father were selected to perform labor so long as they remained able-bodied, after which they were to be murdered in the gas chambers. Wiesel and his father were later deported to the concentration camp at Buchenwald. Until that transfer, he admitted to Oprah Winfrey, his primary motivation for trying to survive Auschwitz was knowing that his father was still alive: "I knew that if I died, he would die." After they were taken to Buchenwald, his father died before the camp was liberated. In Night, Wiesel recalled the shame he felt when he heard his father being beaten and was unable to help.

Wiesel was tattooed with inmate number "A-7713" on his left arm. The camp was liberated by the U.S. Third Army on April 11, 1945, when they were just prepared to be evacuated from Buchenwald.

Post-war career as a writer

France

After World War II ended and Wiesel was freed, he joined a transport of 1,000 child survivors of Buchenwald to Ecouis, France, where the Œuvre de secours aux enfants (OSE) had established a rehabilitation center. Wiesel joined a smaller group of 90 to 100 boys from Orthodox homes who wanted kosher facilities and a higher level of religious observance; they were cared for in a home in Ambloy under the directorship of Judith Hemmendinger. This home was later moved to Taverny and operated until 1947.

Afterwards, Wiesel traveled to Paris where he learned French and studied literature, philosophy and psychology at the Sorbonne. He heard lectures by philosopher Martin Buber and existentialist Jean-Paul Sartre and he spent his evenings reading works by Fyodor Dostoyevsky, Franz Kafka, and Thomas Mann.

By the time he was 19, he had begun working as a journalist, writing in French, while also teaching Hebrew and working as a choirmaster. He wrote for Israeli and French newspapers, including Tsien in Kamf (in Yiddish).

In 1946, after learning of the Irgun's bombing of the King David Hotel in Jerusalem, Wiesel made an unsuccessful attempt to join the underground Zionist movement. In 1948, he translated articles from Hebrew into Yiddish for Irgun periodicals, but never became a member of the organization. In 1949, he traveled to Israel as a correspondent for the French newspaper L'arche. He then was hired as Paris correspondent for the Israeli newspaper Yedioth Ahronoth, subsequently becoming its roaming international correspondent.

Excerpt from Night

Never shall I forget that night, the first night in camp, which has turned my life into one long night, seven times cursed and seven times sealed. Never shall I forget that smoke. Never shall I forget the little faces of the children, whose bodies I saw turned into wreaths of smoke beneath a silent blue sky. Never shall I forget those flames which consumed my faith forever. Never shall I forget that nocturnal silence which deprived me, for all eternity, of the desire to live. Never shall I forget those moments which murdered my God and my soul and turned my dreams to dust. Never shall I forget these things, even if I am condemned to live as long as God Himself. Never.

—Elie Wiesel, from Night.

For ten years after the war, Wiesel refused to write about or discuss his experiences during the Holocaust. He began to reconsider his decision after a meeting with the French author François Mauriac, the 1952 Nobel Laureate in Literature who eventually became Wiesel's close friend. Mauriac was a devout Christian who had fought in the French Resistance during the war. He compared Wiesel to "Lazarus rising from the dead", and saw from Wiesel's tormented eyes, "the death of God in the soul of a child". Mauriac persuaded him to begin writing about his harrowing experiences.

Wiesel first wrote the 900-page memoir Un di velt hot geshvign (And the World Remained Silent) in Yiddish, which was published in abridged form in Buenos Aires. Wiesel rewrote a shortened version of the manuscript in French, La Nuit, in 1955. It was translated into English as Night in 1960. The book sold few copies after its initial publication, but still attracted interest from reviewers, leading to television interviews with Wiesel and meetings with writers such as Saul Bellow.

As its profile rose, Night was eventually translated into 30 languages with ten million copies sold in the United States. At one point film director Orson Welles wanted to make it into a feature film, but Wiesel refused, feeling that his memoir would lose its meaning if it were told without the silences in between his words. Oprah Winfrey made it a spotlight selection for her book club in 2006.

United States

In 1955, Wiesel moved to New York as foreign correspondent for the Israel daily, Yediot Ahronot. In 1969, he married Austrian Marion Erster Rose, who also translated many of his books. They had one son, Shlomo Elisha Wiesel, named after Wiesel's father.

Wiesel in 1987

In the U.S., he eventually wrote over 40 books, most of them non-fiction Holocaust literature, and novels. As an author, he was awarded a number of literary prizes and is considered among the most important in describing the Holocaust from a highly personal perspective. As a result, some historians credited Wiesel with giving the term Holocaust its present meaning, although he did not feel that the word adequately described that historical event. In 1975, he co-founded the magazine Moment with writer Leonard Fein.

The 1979 book and play The Trial of God are said to have been based on his real-life Auschwitz experience of witnessing three Jews who, close to death, conduct a trial against God, under the accusation that He has been oppressive towards the Jewish people.

Wiesel also played a role in the initial success of The Painted Bird by Jerzy Kosinski by endorsing it before it became known the book was fiction and, in the sense that it was presented as all Kosinski's true experience, a hoax.

Wiesel published two volumes of memoirs. The first, All Rivers Run to the Sea, was published in 1994 and covered his life up to the year 1969. The second, titled And the Sea is Never Full and published in 1999, covered the years from 1969 to 1999.

Political activism

Wiesel and his wife, Marion, started the Elie Wiesel Foundation for Humanity in 1986. He served as chairman of the President's Commission on the Holocaust (later renamed the US Holocaust Memorial Council) from 1978 to 1986, spearheading the building of the United States Holocaust Memorial Museum in Washington, D.C. Sigmund Strochlitz was his close friend and confidant during these years.

The Holocaust Memorial Museum gives the Elie Wiesel Award to "internationally prominent individuals whose actions have advanced the Museum's vision of a world where people confront hatred, prevent genocide, and promote human dignity". The Foundation had invested its endowment in money manager Bernard L. Madoff's investment Ponzi scheme, costing the Foundation $15 million and Wiesel and his wife much of their own personal savings.

A staunch foe of the death penalty, Wiesel stated that he thought that even Adolf Eichmann should not have been executed.

Support for Israeli government policy

In 1982, at the request of the Israeli Foreign Ministry, Wiesel agreed to resign from his position as chairman of a planned international conference on the Holocaust and the Armenian genocide. Wiesel then worked with the Foreign Ministry in its attempts to get the conference either canceled or to remove all discussion of the Armenian genocide from it, and to those ends he provided the Foreign Ministry with internal documents on the conference's planning and lobbied fellow academics to not attend the conference.

Following his death, Wiesel was criticized by some for his perceived silence on certain Israeli government policies with regards to the Palestinians. During his lifetime, Wiesel had deflected questions on the topic, claiming to abstain from commenting on Israel's internal debates. Hussein Ibish claimed after his death that despite this position, Wiesel had gone on record as supporting the idea of expanding Jewish settlements into the Palestinian territories conquered by Israel during the 6 Day War, such settlements are considered illegal by the international community.

Awards

Wiesel was awarded the Nobel Peace Prize in 1986 for speaking out against violence, repression, and racism. The Norwegian Nobel Committee described Wiesel as "one of the most important spiritual leaders and guides in an age when violence, repression, and racism continue to characterize the world" and called him a "messenger to mankind". It also stressed that Wiesel's commitment originated in the sufferings of the Jewish people but that he expanded it to embrace all repressed peoples and races.

In his acceptance speech he delivered a message "of peace, atonement, and human dignity". He explained his feelings: "Silence encourages the tormentor, never the tormented. Sometimes we must interfere. When human lives are endangered, when human dignity is in jeopardy, national borders and sensitivities become irrelevant."

He received many other prizes and honors for his work, including the Congressional Gold Medal in 1985, the Presidential Medal of Freedom, and The International Center in New York's Award of Excellence. He was also elected to the American Academy of Arts and Letters in 1996.

Wiesel co-founded Moment magazine with Leonard Fein in 1975. They founded the magazine to provide a voice for American Jews. He was also a member of the International Advisory Board of NGO Monitor.

In April 1999, Wiesel delivered the speech "The Perils of Indifference" in Washington D.C., criticizing the people and countries who chose to be indifferent while the Holocaust was happening. He defined indifference as being neutral between two sides, which, in this case, amounts to overlooking the victims of the Holocaust. Throughout the speech, he expressed the view that a little bit of attention, either positive or negative, is better than no attention at all.

In 2003, he discovered and publicized the fact that at least 280,000 Romanian and Ukrainian Jews, along with other groups, were massacred in Romanian-run death camps.

In 2005, he gave a speech at the opening ceremony of the new building of Yad Vashem, the Israeli Holocaust History Museum:

I know what people say – it is so easy. Those that were there won't agree with that statement. The statement is: it was man's inhumanity to man. NO! It was man's inhumanity to Jews! Jews were not killed because they were human beings. In the eyes of the killers they were not human beings! They were Jews!

In early 2006, Wiesel accompanied Oprah Winfrey as she visited Auschwitz, a visit which was broadcast as part of The Oprah Winfrey Show. On November 30, 2006, Wiesel received a knighthood in London in recognition of his work toward raising Holocaust education in the United Kingdom.

In September 2006, he appeared before the UN Security Council with actor George Clooney to call attention to the humanitarian crisis in Darfur. When Wiesel died, Clooney wrote, "We had a champion who carried our pain, our guilt, and our responsibility on his shoulders for generations."

In 2007, Wiesel was awarded the Dayton Literary Peace Prize's Lifetime Achievement Award. That same year, the Elie Wiesel Foundation for Humanity issued a letter condemning Armenian genocide denial, a letter that was signed by 53 Nobel laureates including Wiesel. Wiesel repeatedly called Turkey's 90-year-old campaign to downplay its actions during the Armenian genocide a double killing.

President George W. Bush, joined by the Dalai Lama and Wiesel, October 17, 2007, to the ceremony at the U.S. Capitol in Washington, D.C., for the presentation of the Congressional Gold Medal to the Dalai Lama

In 2009, Wiesel criticized the Vatican for lifting the excommunication of controversial bishop Richard Williamson, a member of the Society of Saint Pius X. The excommunication was later reimposed.

In June 2009, Wiesel accompanied US President Barack Obama and German Chancellor Angela Merkel as they toured the Buchenwald concentration camp. Wiesel was an adviser at the Gatestone Institute. In 2010, Wiesel accepted a five-year appointment as a Distinguished Presidential Fellow at Chapman University in Orange County, California. In that role, he made a one-week visit to Chapman annually to meet with students and offer his perspective on subjects ranging from Holocaust history to religion, languages, literature, law and music.

In July 2009, Wiesel announced his support to the minority Tamils in Sri Lanka. He said that, "Wherever minorities are being persecuted, we must raise our voices to protest ... The Tamil people are being disenfranchised and victimized by the Sri Lanka authorities. This injustice must stop. The Tamil people must be allowed to live in peace and flourish in their homeland."

In 2009, Wiesel returned to Hungary for his first visit since the Holocaust. During this visit, Wiesel participated in a conference at the Upper House Chamber of the Hungarian Parliament, met Prime Minister Gordon Bajnai and President László Sólyom, and made a speech to the approximately 10,000 participants of an anti-racist gathering held in Faith Hall. However, in 2012, he protested against "the whitewashing" of Hungary's involvement in the Holocaust, and he gave up the Great Cross award he had received from the Hungarian government.

Wiesel was active in trying to prevent Iran from making nuclear weapons, stating that, "The words and actions of the leadership of Iran leave no doubt as to their intentions". He also condemned Hamas for the "use of children as human shields" during the 2014 Israel–Gaza conflict by running an ad in several large newspapers. The Times refused to run the advertisement, saying, "The opinion being expressed is too strong, and too forcefully made, and will cause concern amongst a significant number of Times readers."

Wiesel often emphasized the Jewish connection to Jerusalem, and criticized the Obama administration for pressuring Israeli Prime Minister Benjamin Netanyahu to halt East Jerusalem Israeli settlement construction. He stated that "Jerusalem is above politics. It is mentioned more than six hundred times in Scripture—and not a single time in the Koran ... It belongs to the Jewish people and is much more than a city".

Teaching

Wiesel held the position of Andrew Mellon Professor of the Humanities at Boston University from 1976, teaching in both its religion and philosophy departments. He became a close friend of the president and chancellor John Silber. The university created the Elie Wiesel Center for Jewish Studies in his honor. From 1972 to 1976 Wiesel was a Distinguished Professor at the City University of New York and member of the American Federation of Teachers. In 1982 he served as the first Henry Luce Visiting Scholar in Humanities and Social Thought at Yale University. He also co-instructed Winter Term (January) courses at Eckerd College, St. Petersburg, Florida. From 1997 to 1999 he was Ingeborg Rennert Visiting Professor of Judaic Studies at Barnard College of Columbia University.

Personal life

Wiesel and wife Marion at the 2012 Time 100

In 1969 he married Marion Erster Rose, who originally was from Austria and also translated many of his books. They had one son, Shlomo Elisha Wiesel, named after Wiesel's father. The family lived in Greenwich, Connecticut.

Wiesel was attacked in a San Francisco hotel by 22-year-old Holocaust denier Eric Hunt in February 2007, but was not injured. Hunt was arrested the following month and charged with multiple offenses.

In May 2011, Wiesel served as the Washington University in St. Louis commencement speaker.

In February 2012, a member of the Church of Jesus Christ of Latter-day Saints performed a posthumous baptism for Simon Wiesenthal's parents without proper authorization. After his own name was submitted for proxy baptism, Wiesel spoke out against the unauthorized practice of posthumously baptizing Jews and asked presidential candidate and Latter-day Saint Mitt Romney to denounce it. Romney's campaign declined to comment, directing such questions to church officials.

Death and aftermath

Wiesel died on the morning of July 2, 2016, at his home in Manhattan, aged 87. After a private funeral service was conducted in honor of him at the Fifth Avenue Synagogue, he was buried at the Sharon Gardens Cemetery in Valhalla, New York, on July 3.

Utah senator Orrin Hatch paid tribute to Wiesel in a speech on the Senate floor the following week, in which he said that "With Elie's passing, we have lost a beacon of humanity and hope. We have lost a hero of human rights and a luminary of Holocaust literature."

In 2018, antisemitic graffiti was found on the house where Wiesel was born.

Awards and honors

Honorary degrees

Wiesel had received more than 90 honorary degrees from colleges worldwide.

Hadith studies

From Wikipedia, the free encyclopedia
 
Hadith studies (Arabic: علم الحديث ʻilm al-ḥadīth "science of hadith", also science of hadith, or science of hadith criticism or hadith criticism) consists of several religious scholarly disciplines used by Muslim scholars in the study and evaluation of the Islamic hadith—i.e. the record of the words, actions, and the silent approval of the Islamic prophet, Muhammad.

Determining authenticity of hadith is enormously important in Islam because along with the Quran, the Sunnah of the Islamic prophet—his words, actions, and the silent approval—are considered the explanation of the divine revelation (wahy), and the record of them (i.e. hadith) provides the basis of Islamic law (Sharia). In addition, while the number of verses pertaining to law in the Quran is relatively few, hadith give direction on everything from details of religious obligations (such as Ghusl or Wudu, ablutions for salat prayer), to the correct forms of salutations, and the importance of benevolence to slaves. Thus the "great bulk" of the rules of Islamic law are derived from hadith, along with the Quran as a primary source.

There are three primary ways to determine the authenticity (sihha) of a hadith: by attempting to determine whether there are "other identical reports from other transmitters"; determining the reliability of the transmitters of the report; and "the continuity of the chain of transmission" of the hadith.

Traditional hadith studies has been praised by some as "unrivaled, the ultimate in historical criticism", and heavily criticized for failing to filter out a massive amount of hadith "which cannot possibly be authentic".

Definition

It has been described by one hadith specialist, Jalal al-Din al-Suyuti (d. 911 A.H/ 1505 C.E), as the science of the principles by which the conditions of both the sanad, the chain of narration, and the matn, the text of the hadith, are known. This science is concerned with the sanad and the matn with its objective being distinguishing the sahih, authentic, from other than it. Ibn Hajar al-Asqalani said the preferred definition is: knowledge of the principles by which the condition of the narrator and the narrated are determined.

Types

Some of the disciplines in the science of hadith, according to scholar İsmail Lütfi Çakan, include:

  • the "study of the circumstances surrounding the genesis of each hadith", i.e. the reasons for why the hadith was uttered;
  • the study of the gharib al-hadith, whose works provide "a kind of hadith glossary" of uncommon words found in hadith;
  • the study of ilel al-hadith, which examines deficiencies in the text and/or the chain of a hadith;
  • study of al-hadith al-muhtelif, which attempts to reconcile the contradictions of hadith;
  • the study of naskh or nasikh and mansukh in hadith, which also attempts to reconcile contradictions in hadiths, but by determining which of the contradicting hadith abrogates the other;
  • study of sharh al-hadith, which are commentary on hadith that attempt "to explain the intentions (of) Prophet Muhammad (in uttering it)";
  • study of ʿilm jarḥ wa taʿdīl (wounding and rectifying), which attempts to verify the reliability of transmitters of hadith, their deficiencies and virtues;
  • study of transmitters of hadith, ʿilm al-rijāl (science of men) which provides biographies of the narrators and the different categories they fall under.

History

After the death of Muhammad, his sayings were transmitted orally. According to Islamic tradition, Umar ibn al-Khattab, the second caliph, started the process of collecting all the hadiths together into one unified volume, but gave up the endeavor "for fear the Quran would be neglected by the Muslims" (according to Muhammad Zubayr Siddiqi).

The Umayyad caliph, Umar ibn Abd al-Aziz (aka Umar II, who reigned from 717-720 CE) also started an effort to collect all the hadiths. Teaching and collecting hadiths was part of a plan of his to renew the moral fiber of the Muslim community. He supported teachers of fiqh, sent educators to Bedouin tribes, ordered weekly hadith lectures in the Hejaz, and sent out scholars of hadith to Egypt and North Africa, (according to Muhammad Zubayr Siddiqi).

Umar also ordered the great scholar of Madinah, Abu Bakr ibn Hazm to write down all the hadiths of Muhammad and Umar ibn al-Khattab, particularly those narrated by Aisha. He had these hadiths collected in books which were circulated around the Umayyad Empire. Although these books are lost today, commentaries on them by Ibn al-Nadim reveals that they are organized like books of fiqh, such as the Muwatta of Imam Malik, the first large compilation of hadiths. Imam Malik himself probably followed the general plan of the early books of hadith ordered by Umar.

Hadith studies developed in part because forgery "took place on a massive scale", with perhaps the most famous collector of hadith and practitioner of ʻilm al-ḥadīthMuhammad al-Bukhari—sifting through nearly 600,000, over 16 years before eliminating all but approximately 7400 hadith.

Traditional accounts describe "the systematic study of hadith" as being motivated by the altruism of "pious scholars" seeking to correct this problem. Some scholars (Daniel W. Brown, A. Kevin Reinhart) shed doubt on this. Brown believes the theory "fails" to adequately account "for the atmosphere of conflict" of at least early hadith criticism. The "method of choice" of partisans seeking to discredit opposing schools of Islamic law was to discredit the authorities (transmitters) of their opponent's hadith—to "tear apart" their isnads". (To do this required developing biographical evaluations of hadith transmitters—ʿilm al-rijāl and ilm jarh wa ta’dil). Reinhart finds descriptions of famous companions of Muhammad in Ibn Sa'd's Kitāb aṭ-ṭabaqāt al-kabīr "recording hadith and transmitting it, asking each other about precedents, and reproaching those who disregarded this authentic religious knowledge" in suspicious conformity to the "mythology of the pristine early community".

As the criteria for judging authenticity grew into the six major collections of ṣaḥīḥ (sound) hadith (Kutub al-Sittah) in the third century, the science of hadith was described as having become a "mature system", or to have entered its "final stage".

The classification of Hadith into

  • sahih, sound or authentic;
  • hasan, good;
  • da'if, weak,
  • (another rating is mawḍūʿ, fabricated).

was utilized early in hadith scholarship by Ali ibn al-Madini (161–234 AH). Later, al-Madini's student Muhammad al-Bukhari (810–870) authored a collection, now known as Sahih Bukhari, commonly accepted by Sunni scholars to be the most authentic collection of hadith, followed by that of his student Muslim ibn al-Hajjaj. Al-Bukhari's methods of testing hadiths and isnads are seen as exemplary of the developing methodology of hadith scholarship.

Evaluating authenticity

An elaborate system was developed by scholars of hadith to determine the authenticity of traditions based on "two premises":

  1. that the authenticity of a hadith report is "best measured by the reliability of the transmitters" (known as rāwī pl. ruwāt) of the report;
  2. consequently, "carefully scrutinizing" the "individual transmitters" of the hadith (ilm jarh wa ta’dil; ʿilm al-rijāl) and "the continuity of their chains of transmission" is the best way to measure hadith reliability.

A basic element of hadith studies consist of a careful examination of the chain of transmission (sanad سند, also isnād اسناد, or silsila سِلْسِلَة), relaying each hadith from the Prophet to the person who compiles the hadith. The isnād and the commentary are distinct from the matn (متن), which is the main body, or text, of the hadith, These two terms are the primary components of every hadith.

According to the person most responsible for elevation of the importance of hadith in Islamic law, Imam Al-Shafi‘i,

"In most cases the truthfulness or lack of truthfulness of a tradition can only be known through the truthfulness or lack of truthfulness of the transmitter, except in a few special cases when he relates what cannot possibly be the case, or what is contradicted by better-authenticated information."

The first people who received hadith were Muhammad's "Companions" (Sahaba), who are believed to have understood and preserved it. They conveyed it to those after them as they were commanded; then the generation following them, the "Followers" (Tabi‘un), received it and then conveyed it to those after them, and so on. Thus, the Companion would say, “I heard the Prophet say such and such.” The Follower would say, “I heard a Companion say, ‘I heard the Prophet say’” The one after the Follower would say, “I heard a Follower say, ‘I heard a Companion say, ‘I heard the Prophet say’” and so on.

Criteria to be a ṣaḥīḥ hadith

To be 'ṣaḥīḥ ("sound") hadith, an isolated hadith (Mutawatir hadith were exempt from these tests) "must pass five tests":

  1. "continuity of transmission";
  2. ʿadāla of transmitters, i.e. transmitters must be of good character;
  3. "accuracy (ḍabṭ) of the process of transmission, i.e. narrators must not be prone to carelessness or known to have poor memories";
  4. absence of "irregularities" (shadhūdh), i.e. hadith must not contradict a "more reliable source";
  5. "absence of corrupting defects(ʿilla qādiḥa), i.e. inaccuracies in reporting the actual chain of transmission."

Biographical evaluation

An important discipline within hadith studies is biographical evaluation, the study of transmitters of hadith, ʿilm al-rijāl, (literally "science of men") mentioned above. These are the narrators who make up the sanad. Ilm ar-rijal is based on certain verses of the Quran.

Transmitters are studied and rated for their "general capacity" (ḍābit; itqān) and their moral character (ʿadāla).

  1. General capacity is measured by qualities such as memory, linguistic ability. Transmitters that have good memories and linguistic ability "might be considered competent (ḍābit)".
  2. ʿadāla transmitters must be "adult Muslims, fully in control of their mental faculties, aware of their moral responsibilities, free from guilt for major sins, and not prone to minor sins". Examples of ratings of transmitters include "trustworthy" or thiqa for ones that possess both ʿadāla and ḍābit. Transmitters that are ʿadāla but show signs of carelessness are rated honest or ṣudūq. The result of this study were "vast biographical dictionaries" to check against the isnads of individual hadith.

Not all transmitters were evaluated for these characteristics and rated. Companions of the prophet (ṣaḥāba) were traditionally considered to possess collective moral turpitude or taʿdīl, by virtue of their exposure to the Prophet, so that they all possessed ʿadāla without needing to be evaluated. (This quality was similar to that of Prophetic infallibility (ʿiṣma) but of course lower in level.)

Shaykh Muhammad Zakariya al-Kandahlawi has mentioned that Imam Bukhari (the famous compiler of "sound" hadith) listed the following as criterion for a muhaddith:

  1. The four things which one must write are:
    1. The hadith of the Prophet and his rulings
    2. The sayings of the Sahaba and the status of each sahabi (companions of the prophet)
    3. The sayings of the Tabieen (i.e., the Salaf-us Salaheen who met the Sahaba, but did not meet the Blessed Prophet). The level of each of the Tabieen. Who amongst them was reliable and who was unreliable
    4. Knowledge of all the narrators who narrate hadith and their history
  1. The history of the narrators must include four things:
    1. Their Isma-ul-Rijjal (biographies)
    2. Their kunniyaat (nicknames)
    3. Their place of settlement
    4. Their date of birth and date of death (to verify whether this person met the people whom he narrated from)

Traditional importance of the sanad

The second criteria after judging the general ability and moral probity of the transmitters, is the "continuity" of the chain of transmission of the hadith. The transmitters must be shown to have received the accounts of the prophet "in an acceptable manner from the preceding authority in the chain".

Transmitters must have lived during the same period, they must have had the opportunity to meet, and they must have reached sufficient age at the time of transmission to guarantee their capacity to transmit.

Early religious scholars stressed the importance of the sanad. For example, according to an early Quranic exegete, Matr al-Warraq, the verse from the Quran, “Or a remnant of knowledge,” refers to the isnad of a hadith.

In addition, Abd Allah ibn al-Mubarak said, “The isnad is from the religion; were it not for the isnad anyone could say anything they wanted.” According to Ibn al-Salah, the sanad originated within the Muslim scholastic community and remains unique to it. Ibn Hazm said that the connected, continuous sanad is particular to the religion of Islam: the sanad was also used by the Jewish community, but they had a break of more than 30 generations between them and Moses, and the Christians limited their use of the sanad to the prohibition of divorce. Ibn Taymiyyah also said that the knowledge of isnad is particular to the followers of Prophet Muhammad.

The practice of paying particular attention to the sanad can be traced to the generation following that of the Companions, based upon the statement of Muhammad Ibn Sirin: “They did not previously inquire about the sanad. However, after the turmoil occurred they would say, ‘Name for us your narrators.’ So the people of the Sunnah would have their hadith accepted and the people of innovation would not.” Those who were not given to require a sanad were, in the stronger of two opinions, the Companions of the Prophet, while others, such as al-Qurtubi, include the older of the Followers as well. This is due to the Companions all being considered upright, trustworthy transmitters of hadith, such that a mursal hadith narrated by a Companion is acceptable.

Al-Khatib al-Baghdadi, stating likewise, cited various evidences for this, from them, the Quranic verse, “And you were the best nation brought about to mankind.” The fitnah referred to is the conflicting ideologies of the Kharijites and the Ghulat that had emerged at the time of the third Caliph Uthman ibn Affan, his assassination and the social unrest of the Kharijites in opposition to the succeeding rulers, Ali and Muawiyah. The death of Uthman was in the year 35 after the migration.

The matn

According to scholar Daniel Brown, in traditional hadith studies, "the possibility" of criticizing the matn as well as the isnad "was recognized in theory, but the option was seldom systematically exercised".

Syrian hadith scholar Dr. Salah al-Din al-Idlibi is expert in the relatively new field of matn criticism. Whereas traditional criticism has focused on verifying the trustworthiness of the people transmitting the hadith, matn criticism studies the contents of the hadith and compares this with the contents of other hadiths and any other available historical evidence with the aim of arriving at an objective historical reality of the event described by the hadith.

Muhaddith: scholar of hadith

The term muḥaddith (plural muḥaddithūn often translated as "traditionist") refers to a specialist who profoundly knows and narrates hadith, the chains of their narration isnad, and the original and famous narrators.

According to the 8th century Imam, Sheikh Muhammad ibn Idris ash-Shafi`i, a muhaddith is someone who has memorised at least 400,000 narrations along with the chain of narrators for each narration can be a Mujtahid Mutlaq and does not have to follow a Madhab. The female equivalent is a muhadditha.

In describing the muhaddith, Al-Dhahabi raised the question, "Where is the knowledge of hadith, and where are its people?" Answering his own question, he said, "I am on the verge of not seeing them except engrossed in a book or under the soil."

Both men and women can serve as muhaddithin (traditionists). The requirements for a muhaddith are the same requirements that apply to the reception and transmission of reports (riwayah) in the Islamic tradition more generally: truthfulness, integrity, a competent and accurate memory, being free of prejudice or compulsion that might be presumed to distort the reporting.

There are numerous women who have served as muhaddithat in the history of Islam. Nadwi counts more than 8000 based on the biographical dictionaries of the classical and medieval period. Many of these women belonged to the most outstanding scholars and traditionists of their time and men were proud to receive narration from them. One must also note that muhaddithat transmitted the same body of knowledge as their male counterparts – there were and are no restrictions on what could be transmitted by women.

The pursuit of knowledge was held above all else and was given even more importance if one travelled to seek that knowledge. Many muhaddithats were born into a prominent family that had connection with the upper class or had a male relative who had a vested interest and/or connections that enhanced the career of these muhaddithats. In many cases, muhaddithats were the last living link between older scholars and the younger generations as they tended to live longer. Their isnads were held with greater value due to this. Below are some of the most prominent muhaddithats of their times.

Shuhda al-Katiba (482-574CE)

Shuhda al-Katiba was born in Baghdad during a time of turmoil. There were refugees fleeing and the city was being attacked. Despite this, Shuhda was able to find success. Her father played a big role in her education and she has credited him to her success in the field. She began her education at the age of eight when her father began introducing her to some of the most prominent and sought after muhaddiths and scholars of their time. Her husband also gave her access to the upper class of Baghdad. She gained fame later in her career and was known to be the last living link between prominent scholars and the younger generations. This made her isnad a particularly sought after one.

Fatimah Bint Sa’d al-Khayr (525-600CE)

Fatimah Bint Sa’d al-Khayr was born in China but later dwelled in Isfahan and Baghdad. Her father was a scholar who felt it was very important for his children to be immersed in religious studies, particularly Hadith studies. He had traveled to many places in pursuit of this knowledge and even taught some of his children himself. Fatimah was brought up fully immersed in Hadith studies. Her sister also became a prominent muhaddithat. Her husband was very wealthy, held a high position in society, and a scholar himself, though not at the same level as Fatimah. She lived in Damascus with him for some time then moved to Cairo. Fatimah’s career prospered in these two cities towards the end of her life. She had many students who traveled far and wide to recite to her and learn from her. She died when she was 78 years old. There is some mystery surrounding her life. When her husband died, he had not a penny to his name despite being very wealthy in his life. No one is aware of how this occurred.

Zaynab Bint al-Kamal (646-740CE)

Zaynab Bint al-Kamal started her career at the age of one in Damascus. It is thought that the credit for that goes to her uncle rather than her father, as seen with other muhaddithats, who took her to prominent scholars at a very young age. Damascus was prospering during her life which gave her career extra stability. She never married, which could have contributed to her extensive education as she had more time to devote to it. Her students went on to become very prominent scholars with their impressive isnads thanks to her. As mentioned with the above muhaddithats, since Zaynab started so young, she had hadiths from scholars who had died when she was teaching which made her highly sought after. People were willing to travel great distances to meet her. She died in her late 90s which is an impressive age for her time period.

A’isha Bint Muhammad (723-816CE)

A’isha Bint Muhammad came from a very prominent religious family. She started her career at four years old while Damascus was still prospering. Similar to the scholars mentioned above, she was the last link to many muhaddithats who had died which made her the last living link. Her students became prominent scholars as well. She died at the age of 93. By the time of her death, she had the reputation of a very highly regarded muhadditha.

Reporting or narrating (riwayah) must be differentiated from giving testimony (shahadah). While women are entirely equal in riwayah, many Islamic jurists place restrictions on women in shahadah – thus in several schools of law the testimony of two women is equal to that of a man.

A muḥaddith or "traditionist" is not the same as one of the Ahl al-Hadith or a "traditionalist", a member of a movement of hadith scholars who considered the Quran and authentic hadith to be the only authority in matters of law and creed.

Sunni literature for hadith studies

As in any Islamic discipline, there is a rich history of literature describing the principles and fine points of hadith studies. Ibn Hajar al-Asqalani provides a summation of this development with the following: “Works authored in the terminology of the people of hadith have become plentiful from the Imaams both old and contemporary:

  1. From the first of those who authored a work on this subject is the Judge, Abū Muḥammad al-Rāmahurmuzī in his book, ‘al-Muhaddith al-Faasil,’ however, it was not comprehensive.
  2. And al-Hakim, Abu Abd Allah an-Naysaburi, however, it was neither refined nor well arranged.
  3. And following him, Abu Nu’aym al-Asbahani, who wrote a mustakhraj upon the book of the later, (compiling the same narrations al-Hakim cited using his own sanads.) However, some things remain in need of correction.
  4. And then came al-Khatib Abu Bakr al-Bagdadi, authoring works in the various disciplines of hadith studies a book entitled al-Kifaayah and in its etiquettes a book entitled al-Jami’ Li Adab ash-Sheikh wa as-Saami. Scarce is the discipline from the disciplines of the science of hadeeth that he has not written an individual book regarding, as al-Hafith Abu Bakr ibn Nuqtah said: 'Every objective person knows that the scholars of hadeeth coming after al-Khatib are indebted to his works.' After them came others, following al-Khatib, taking their share from this science."
  5. al-Qadi ‘Eyaad compiled a concise book naming it al-Ilmaa’.
  6. Abu Hafs al-Mayanajiy a work giving it the title Ma Laa yasu al-Muhaddith Jahluhu or That Which a Hadith Scholar is Not Allowed Ignorance Of. There are numerous examples of this which have gained popularity and were expanded upon seeking to make plentiful the knowledge relating to these books and others abridged making easy their understanding.
  7. This was prior to the coming of the memorizer and jurist Taqiyy ad-Deen Aboo ‘Amrin ‘Uthmaan ibn al-Salah ‘Abd ar-Rahmaan ash-Shahruzuuree, who settled in Damascus. He gathered, at the time he had become a teacher of hadith at the Ashrafiyyah school, his well known book, editing the various disciplines mentioned in it. He dictated it piecemeal and, as a result, did not succeed in providing it with an appropriate order. He occupied himself with the various works of al-Khatib, gathering his assorted studies, adding to them from other sources the essence of their benefits. So he combined in his book what had been spread throughout books other than it. It is due to this that people have focused their attention upon it, following its example. Innumerable are those who rendered his book into poetry, abridged it, sought to complete what had been left out of it or left out any extraneous information; as well as those who opposed him in some aspect of his work or supported him.

Discussion of validity

The science of hadith has not been without critics. According to Muhammad Husayn Haykal, "despite the great care and precision of the Hadith scholars, much of what they regarded as true was later proved to be spurious." He goes on to quote Al-Nawawi (1233–1277), who stated that "a number of scholars discovered many hadiths" in the two most authentic hadith collection Sahih al-Bukhari and Sahih Muslim "which do not fulfill the conditions of verification assumed by these men" (i.e. by the hadith collectors Muhammad al-Bukhari and Muslim ibn al-Hajjaj).

Among the criticisms made (of non-sahih as well as sahih hadith) of is that there was a suspiciously large growth in their number with each generation in the early years of Islam; that large numbers of hadith contradicted each other; and that the genre's status as a primary source of Islamic law motivated the creation of fraudulent hadith.

Modern Western scholars in particular have "seriously questioned the historicity and authenticity of the hadith", according to John Esposito, maintaining that "the bulk of traditions attributed to the Prophet Muhammad were actually written much later." According to Esposito, Schacht "found no evidence of legal traditions before 722," from which Schacht concluded that "the Sunna of the Prophet is not the words and deeds of the Prophet, but apocryphal material" dating from later.

Henry Preserved Smith and Ignác Goldziher also challenged the reliability of the hadith, Smith stating that "forgery or invention of traditions began very early" and "many traditions, even if well authenticated to external appearance, bear internal evidence of forgery." Goldziher writes that "European critics hold that only a very small part of the ḥadith can be regarded as an actual record of Islam during the time of Mohammed and his immediate followers." In his Mohammedan Studies, Goldziher states: "it is not surprising that, among the hotly debated controversial issues of Islam, whether political or doctrinal, there is not one in which the champions of the various views are unable to cite a number of traditions, all equipped with imposing isnads".

Patricia Crone noted that early traditionalists were still developing conventions of examining the chain of narration (isnads) that by later standards were sketchy/deficient, even though they were closer to the historical material. Later though they possessed impeccable chains, but were more likely to be fabricated. Reza Aslan quotes Schacht's maxim: `the more perfect the isnad, the later the tradition`, which he (Aslan) calls "whimsical but accurate".

Bernard Lewis writes that "the creation of new hadiths designed to serve some political purpose has continued even to our own time." In the buildup to the first Gulf War a "tradition" was published in the Palestinian daily newspaper Al-Nahar on December 15, 1990, "and described as `currently in wide circulation`" It "quotes the Prophet as predicting that "the Greeks and Franks will join with Egypt in the desert against a man named Sadim, and not one of them will return".

Others have praised the tradition for its ingenuity:

Sheikh Ahmad Kutty, a Senior Lecturer and an Islamic Scholar at the Islamic Institute of Toronto, Ontario, Canada, clarifies what he feels supports the validity of hadith studies:

There is a basic distinction between Islam and other religions in this regard: Islam is singularly unique among the world religions in the fact that in order to preserve the sources of their religion, the Muslims invented a scientific methodology based on precise rules for gathering data and verifying them. As it has been said, 'Isnad or documentation is part of Islamic religion, and if it had not been for isnad, everybody would have said whatever he wanted.

Emic and etic

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Emic_and_etic In anthropology , folk...