Sahih al-Bukhari 2535
صحيح البخاري#2535SahihNarrated Ibn `Umar:Allah's Messenger (ﷺ) forbade the selling or donating the Wala' of a freed slave
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: 49:19