Sahih al-Bukhari 6759
صحيح البخاري#6759SahihNarrated Ibn `Umar:When Aisha intended to buy Barira, she said to the Prophet, "Barira's masters stipulated that they will have the Wala." The Prophet (ﷺ) said (to Aisha), "Buy her, as the Wala is for the one who manumits
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: 85:36