Sahih Muslim 978
صحيح مسلم#978SahihNu'man b. Bashir reported:I heard the Messenger of Allah (ﷺ) say: Straighten your rows, or Allah would create dissension amongst you
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: 4:140