(10) CHAPTER. The selling and conferring on others of the Wala of a manumitted slave.
Narrated Ibn `Umar: Allah's Apostle forbade the selling or donating the Wala' of a freed slave.
Narrated `Aisha: I bought Buraira but her masters put the condition that her Wala' would be for them. I told the Prophet 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 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.