Sahih Muslim 1107
صحيح مسلم#1107SahihMaimuna reported:When the Messenger of Allah (ﷺ) prostrated himself, if a lamb wanted to pass between his arms, it could pass
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: 4:269