Sahih Muslim 1405
صحيح مسلم#1405SahihKhabbab reported:We complained to the Messenger of Allah (ﷺ) (the difficulty of) saying prayer on the intensely heated (ground or sand), but he paid no heed to our complaint
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:239