Sahih al-Bukhari 2564
صحيح البخاري#2564SahihNarrated `Amra bint `Abdur-Rahman: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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 50:5