Sahih Muslim 483
صحيح مسلم#483SahihAnas b. Malik reported:The Messenger of Allah (ﷺ) said: I would be the first among people to intercede in the Paradise and amongst the apostles I would have the largest following (on the Day of Resurrection)
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: 1:389