Sahih al-Bukhari 5914
صحيح البخاري#5914SahihNarrated `Abdullah bin `Umar:I heard `Umar saying, "Whoever braids his hair should shave it (on finishing Ihram). You'd better not do, something like Talbid." Ibn `Umar used to say: "I saw Allah's Messenger (ﷺ) with his hair stuck together with gum
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: 77:129