Hisham bin 'Ammar bin Nasayr هشام بن عمار بن نصير · The Chapters on Manumission (of Slaves)

“A man among us promised freedom to a slave after his death, and he did not have any property other than him (this slave). So the Prophet (ﷺ) sold him, and Ibn (Nahham), a man from Banu 'Adi, bought him.”

“If anyone of you (women) has a Mukatab, and he has enough (wealth) to pay off (his contact of manumission), she must veil herself from him.”

I said to Ka'b bin Murrah, tell us a Hadith from the Messenger of Allah (ﷺ), but be careful. He said: I heard the Messenger of Allah (ﷺ) say: “Whoever frees a Muslim man, he will be his ransom from the Fire; each of his bones will suffice (as a ransom) for each of his bones. Whoever frees two Muslim women, they will be his ransom from the Fire; each of their two bones will suffice (as a ransom) for…

“Whoever becomes the master of a Mahram relative (with whom marriage is not lawful), he becomes free.”