Sahih Muslim 1179
صحيح مسلم#1179SahihIbn 'Umar reported:As the people were engaged in the morning prayer a man came to them. The rest of the hadith is the same
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: 5:19