Sahih Muslim 2245
صحيح مسلم#2245SahihJabir said:Allah's Messenger (ﷺ) forbade that the graves should be plastered or they be used as sitting places (for the people), or a building should be built over them
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: 11:121