(10) باب بَيْعِ الْوَلاَءِ وَهِبَتِهِ
Narrated `Aisha:
I bought Buraira but her masters put the condition that her Wala' would be for them. I told the Prophet (ﷺ) about it. He said (to me), "Manumit her as her Wala' will be for the one who pays the price." So, I manumitted her. The Prophet (ﷺ) called Buraira and gave her the option of either staying with her husband or leaving him. She said, "Even if he gave me so much money, I would not stay with him," and so she preferred her freedom to her husband.
Reference: Sahih al-Bukhari 2536
In-book reference: Book 49, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 46, Hadith 713