Sahih al-Bukhari 2293
صحيح البخاري#2293SahihNarrated Anas:`Abdur-Rahman bin `Auf came to us and Allah's Messenger (ﷺ) established a bond of brotherhood between him and Sa`d bin Rabi`a
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: 39:4