Barirah went to Aisha, the mother of the faithful believers to seek her help in her emancipation Aisha said to her, "If your masters agree, I will pay them your price in a lump sum and manumit (free) you." Barirah mentioned that offer to her masters but they refused to sell her unless the Wala' was for them. `Aisha told Allah's Messenger (ﷺ) about it. He said, "Buy and manumit her as the Wala' is for the liberator."
Sahih al-Bukhari Book 50, Hadith 5
← Previous Hadith Barirah came (to `Aisha) and said, "I have made a contract of emancipation with my masters for nine Uqiyas (of gold) to be paid in yearly installments. Therefore, I seek your help." `Aisha said, "If your masters agree, I will pay them the sum at once and free you on condition that your Wala' will be for me." Barirah went to her masters but they refused that offer. She (came back) and said, "I presented to them the offer but they refused, unless the Wala' was for them." Allah's Messenger (ﷺ) heard of that and asked me about it, and I told him about it. On that he said, "Buy and manumit her and stipulate that the Wala' should be for you, as Wala' is for the liberator." `Aisha added, "Allah's Messenger (ﷺ) then got up amongst the people, Glorified and Praised Allah, and said, 'Then after: What about some people who impose conditions which are not present in Allah's Laws? So, any condition which is not present in Allah's Laws is invalid even if they were one-hundred conditions. Allah's ordinance is the truth, and Allah's condition is stronger and more solid. Why do some men from you say, O so-and-so! manumit the slave but the Wala will be for me? Verily, the Wala is for the liberator."

Sahih al-Bukhari Book 50, Hadith 4 Next Hadith → I went to `Aisha and said, "I was the slave of `Utba bin Abu Lahab. "Utba died and his sons became my masters who sold me to Ibn Abu `Amr who manumitted me. The sons of `Utba stipulated that my Wala' should be for them." `Aisha said, "Barirah came to me and she was given the writing of emancipation by her masters and she asked me to buy and manumit her. I agreed to it, but Barirah told me that her masters would not sell her unless her Wala' was for them." `Aisha said, "I am not in need of that." When the Prophet (ﷺ) heard that, or he was told about it, he asked `Aisha about it. `Aisha mentioned what Barirah had told her. The Prophet (ﷺ) said, "Buy and manumit (free) her and let them stipulate whatever they like." So, `Aisha bought and manumitted her and her masters stipulated that her Wala' should be for them." The Prophet;, said, "The Wala' will be for the liberator even if they stipulated a hundred conditions."

Sahih al-Bukhari Book 50, Hadith 6