Umar bin Khattab consulted the people regarding a woman's miscarriage, meaning when she loses her unborn child.Mughira bin Shuba said, "I witnessed the Messenger of Allah ﷺ rule in such a case that compensation of a male or female slave be given."Umar said, "Bring me someone who will testify along with you."So Muhammad bin Maslama testified along with him.
حدثنا أبو بكر بن أبي شيبة وعلي بن محمد قالا حدثنا وكيع عن هشام بن عروة عن أبيه
استشار عمر بن الخطاب الناس في إملاص المرأة يعني سقطها فقال المغيرة بن شعبة شهدت رسول الله ﷺ قضى فيه بغرة عبد أو أمة فقال عمر ائتني بمن يشهد معك فشهد معه محمد بن مسلمة
Reference (Takhrij) it was recorded by Muslim in "Qasama and Muharibin," chapter "The blood money for a fetus and the obligation of blood money in killing by mistake or quasi-intentional killing... etc.," hadith 1683, from Ibn Abu Shayba through this route.