It is narrated from Sayyiduna al-Miswar bin Makhramah (may Allah be pleased with him) that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) consulted the people about a woman's miscarriage, and al-Mughirah bin Shu'bah (may Allah be pleased with him) said: "I saw the Messenger of Allah (peace and blessings be upon him): he (peace and blessings be upon him) judged in it with (the payment of) a male or female slave (ghurrah)." Sayyiduna Umar (may Allah be pleased with him) said: Bring me someone who will testify along with you. So Sayyiduna Muhammad bin Maslamah (may Allah be pleased with him) came to him.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16558