Sahih al-Bukhari 542
صحيح البخاري#542SahihNarrated Anas bin Malik:When we offered the Zuhr prayers behind Allah's Messenger (ﷺ) we used to prostrate on our clothes to protect ourselves from the heat
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: 9:19