Sunan an-Nasa'i 4824

It was narrated that Al-Muhgirah bin Shu'bah said:"A woman of Banu Lihyan struck her co-wife with a tent pole and killed her, and the slain woman was pregnant. The Messenger of Allah ruled that the Diyah was to be paid by the'Asbah of the killer, and that a slave should be given (as Diyah) for the child in her womb