عَن الْحسن عَن سَمُرَة عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «من ملك ذَا رحم محرم فَهُوَ حُرٌّ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَابْنُ مَاجَه

Jabir said

In the time of God’s Messenger and of Abu Bakr we sold slave women who had borne children, but when ‘Umar was in power he forbade us to do so and we stopped. Abu Dawud transmitted it.