Sahih Muslim 2241
صحيح مسلم#2241SahihIbn 'Abbas said that a piece of red stuff was put in the grave of Allah's Messenger (ﷺ)
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: 11:118