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Historically, slavery has been regulated, supported or opposed on religious grounds. 

In Judaism, slaves were given a range of treatments and protections. They were to be treated as extended family with certain protections and could be freed. They were property but could also own material goods.

Early Christian authors maintained spiritual equality of slaves and free persons, while accepting slavery as an institution. Early modern papal decrees allowed enslavement of unbelievers, though some popes denounced slavery from the 15th century onwards. In the eighteenth century the abolition movement took shape among Christians across the globe, but various denominations continued to be pro-slavery into the 19th century. Enslaved non-believers were sometimes converted to Christianity, but elements of their traditional beliefs merged with their Christian beliefs.

Early Islamic texts encourage kindness towards slaves and manumission, while permitting enslavement of non-Muslim prisoners of war.

Slavery in the Bible