Sahih Muslim 5446
صحيح مسلم#5446SahihA'isha reported that the pillow on which Allah's Messenger (ﷺ) reclined was of leather stuffed with palm fibre
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: 37:61