Sahih al-Bukhari 2544
صحيح البخاري#2544SahihNarrated Abu Musa:Allah's Messenger (ﷺ) said, "He who has a slave-girl and educates and treats her nicely and then manumits and marries her, will get a double reward
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 49:27