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Blood libel or ritual murder libel (also blood accusation) is an antisemitic canard accusing Jews of kidnapping and murdering Christian children in order to use their blood as part of religious rituals. Historically, these claims—alongside those of well poisoning and host desecration—have been a major theme of the persecution of Jews in Europe

Blood libels typically say that Jews require human blood for the baking of matzos for Passover, although this element was allegedly absent in the earliest cases which claimed that then-contemporary Jews reenacted the crucifixion. The accusations often assert that the blood of the children of Christians is especially coveted, and, historically, blood libel claims have been made in order to account for the otherwise unexplained deaths of children. In some cases, the alleged victim of human sacrifice has become venerated as a martyr, a holy figure around whom a martyr sect might arise. Three of these – William of Norwich, Little Saint Hugh of Lincoln, and Simon of Trent – became objects of local sects and veneration, and in some cases they were added to the General Roman Calendar. One, Gavriil Belostoksky, was canonized by the Russian Orthodox Church.

In Jewish lore, blood libels were the impetus for the creation of the Golem of Prague by Rabbi Judah Loew ben Bezalel in the 16th century. According to Walter Laqueur:
Altogether, there have been about 150 recorded cases of blood libel (not to mention thousands of rumors) that resulted in the arrest and killing of Jews throughout history, most of them in the Middle Ages. In almost every case, Jews were murdered, sometimes by a mob, sometimes following torture and a trial.
The term 'blood libel' has also been used to refer to any unpleasant or damaging false accusation, and it has taken on a broader metaphorical meaning. However, this usage remains controversial, and Jewish groups have objected to such usage.

Jewish law against murder, sacrifice, and consumption of blood