Sahih Muslim 1054
صحيح مسلم#1054SahihAnas reported:I never prayed behind an Imam who was more brief and more perfect in prayer than the Messenger of Allah (ﷺ)
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: 4:216