Sahih Muslim 983
صحيح مسلم#983SahihAbu Sa'id al-Khudri reported:The Messenger of Allah (ﷺ) saw people at the end of the mosque, and then the (above-mentioned hadith) was narrated
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: 4:145