“We used to sell our slave women and the mothers of our children (Umahat Awaldina) when the Prophet ﷺ was still living among us, and we did not see anything wrong with that.” (Using translation from Ibn Mājah 2517)
أَنَّهُ سَمِعَهُ يَقُولُ إِنَّا كُنَّا نَبِيعُ سَرَارِيَّنَا أُمَّهَاتِ أَوْلَادِنَا وَالنَّبِيُّ ﷺ فِينَا حَيٌّ لَا يَرَى بِذَلِكَ بَأْسًا