Sahih al-Bukhari 2974
صحيح البخاري#2974SahihNarrated Tha`laba bin Abi Malik Al-Qurazi:When Qais bin Sa`d Al-Ansari, who used to carry the flag of the Prophet, intended to perform Hajj, he combed 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: 56:183