Chapter 49: Manumission of Slaves
Narrated Abu Musa Al-Ash 'ari: The Prophet (ﷺ) said, "He who has a slave-girl and teaches her good manners and improves her education
and then manumits and marries her, will get a double reward; and any slave who observes Allah' s
right and his master' s right will get a double reward."
Sahih al-Bukhari 2547