Musannaf Ibn Abi Shaybah

Hazrat Miswar bin Makhramah narrates that Hazrat Umar bin Khattab was consulting people regarding the compensation (diyah) for a child in a woman's womb who is killed before birth. Hazrat Mughirah bin Shu'bah said: I was present with the Prophet Muhammad (peace and blessings be upon him), and he (peace be upon him) gave the verdict of "ghurrah" (i.e., a male or female slave) in this matter. Hazrat Umar said to him: Bring someone who will testify to this decision with you. So Hazrat Muhammad bin Maslamah testified in his favor.