Musannaf Ibn Abi Shaybah 34977 — What they said on a woman

Yahya bin Sa'id (may Allah have mercy on him) says that Umar bin Abd al-Aziz (may Allah have mercy on him) said: "The umm walad (a slave woman who has borne her master's child) of a man from the Muslims apostatized, so that man sold her at Dumat al-Jandal to a person not of her religion."