“Umar bin Khattab consulted the people concerning a woman who had been caused to miscarry. Al-Mughirah bin Shu'bah said: 'I saw the messenger of Allah ﷺ rule that a slave, male or female, be given as blood money (for a fetus).' 'Umar said: 'Bring me someone who will testify alongside you. So he brought Muhammad bin Maslamah to testify along with him.'” (Using translation from Ibn Mājah 2640)
الْمُغِيرَةُ بْنُ شُعْبَةَ شَهِدْتُ رَسُولَ اللهِ ﷺ قَضَى فِيهِ بِغُرَّةٍ عَبْدٍ أَوْ أَمَّةٍ قَالَ فَقَالَ عُمَرُ ائْتِنِي بِمَنْ يَشْهَدُ مَعَكَ قَالَ فَشَهِدَ لَهُ مُحَمَّدُ بْنُ مَسْلَمَةَ