Slavery was a world order before Islam, and Islam denied its sources in prisoners of war, and prohibited slavery by kidnapping and sale. The expansion of slavery widened the doors of emancipation in penances, offices and stock "and in the necks" of Zakat, and enjoined good treatment and prevented the sale of the mother of the child. Slavery ended in practice by international agreements, and is seen by many modern scholars as permissible to be restricted in favor. "In the necks" [Repenion: 60]
