Sunan an-Nasa'i 4642
سنن النسائي#4642SahihIt was narrated that 'Aishah said:"I bought Barirah and her masters stipulated that her loyalty (Wala) should be to them, I mentioned that to the Prophet and he said: 'Set her free, and loyalty belongs to the one who pays the silver.''' She said: "so I set her free. The Messenger of Allah called her and gave her the choice regarding her husband, and she chose herself. Her husband was a free man
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahShadh
Al-AlbaniShadh
Zubair Ali ZaiSahih
In-book reference: 44:194