Sahih al-Bukhari 1208
صحيح البخاري#1208SahihNarrated Anas bin Malik:We used to pray with the Prophet (ﷺ) in scorching heat, and if someone of us could not put his face on the earth (because of the heat) then he would spread his clothes and prostrate over them
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: 21:12