Sahih Muslim 1113
صحيح مسلم#1113SahihA'isha reported:The Messenger of Allah (ﷺ) was asked about sutra of a worshipper; he said: Equal to the back of the saddle
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: 4:275