Musannaf Ibn Abi Shaybah 30663 — A man who marries a slave woman

Abu Ma'shar reports that it is narrated from Ibrahim, concerning a slave who has a free woman as his wife, or a free man who has a slave woman as his wife, one of whom commits zina (unlawful sexual intercourse), that he said: The punishment of stoning is not due on either of them until they are both free Muslims.