It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that Sayyiduna Umar (may Allah be pleased with him) sought counsel concerning a woman's miscarriage - that is, the loss of the foetus. Al-Mughirah bin Shu'bah (may Allah be pleased with him) said: I said to him: "The Messenger of Allah (peace and blessings be upon him) judged in this case that a ghurrah be given." Sayyiduna Umar (may Allah be pleased with him) said: "If you are truthful, bring someone who knows this." So I brought Muhammad bin Maslamah (may Allah be pleased with him), and he came and said: "The Messenger of Allah (peace and blessings be upon him) judged in this case that a ghurrah be given."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18008