Sahih al-Bukhari 2537
صحيح البخاري#2537SahihNarrated Anas:Some men of the Ansar asked for the permission of Allah's Messenger (ﷺ) and said, "Allow us to give up the ransom from our nephew Al-`Abbas. The Prophet (ﷺ) said (to them), "Do not leave (even) a Dirham (of his ransom)
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: 49:21