Sahih al-Bukhari 6287
صحيح البخاري#6287SahihNarrated the uncle of `Abbas bin Tamim:I saw Allah's Messenger (ﷺ) lying on his back in the mosque and putting one of his legs over the other
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: 79:59