Sahih al-Bukhari 171
صحيح البخاري#171SahihNarrated Anas:When Allah's Messenger (ﷺ) got his head shaved, Abu- Talha was the first to take some of his hair
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: 4:37