Sunan an-Nasa'i 3345
سنن النسائي#3345SahihIt was narrated that Abu Musa said:"The Messenger of Allah said: 'Whoever manumits his female slave, then marries her, he will have two rewards
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 26:150