Musannaf Ibn Abi Shaybah 22823 — Selling an umm walad when she has

Muhammad bin Abdullah bin Qarib al-Thaqafi narrated from his father that he bought a slave woman from a man for four thousand dirhams, and she had already miscarried an (incomplete) child by her master. When news of this reached Sayyiduna Umar (may Allah be pleased with him), he came to him, struck him with his whip and said: After your flesh has mixed with her flesh, and your blood with her blood, you sell her? May Allah curse the Jews: fat was forbidden to them, so they sold it and consumed its price.