Sahih al-Bukhari 4162
صحيح البخاري#4162SahihNarrated Sa`id bin Al-Musaiyab:That his father said, "I saw the Tree (of the Ar-Ridwan Pledge of allegiance) and when I returned to it later, I was not able to recognize it. (The sub--narrator Mahmud said, Al-Musaiyab said, 'Then I forgot it (i.e., the Tree)
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: 64:204