Sahih Muslim 1504
صحيح مسلم#1504SahihMaimuna, the wife of the Messenger of Allah (ﷺ), reported:The Messenger of Allah (ﷺ) said prayer while I was by his side, and at times when he prostrated his cloth touched me, and he prayed on a small mat
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: 5:337