The Jews of Khaybar finally surrendered after seeing no way out and were allowed to live in the oasis on the condition that they would give one-half of their produce to the Muslims. Jews continued to live in the oasis for several more years until they were expelled by caliph Umar. The imposition of tribute upon the conquered Jews served as a precedent for provisions in the Islamic law requiring the exaction of tribute known as "jizya" from Dhimmi subjects in areas under Muslim rule, and confiscation of land belonging to non-Muslims into the collective property of the Muslim community.