Sahih Muslim 7071
صحيح مسلم#7071SahihAbu Ma'mar reported on the authority of Abdullah that the moon was split up during lifetime by Allah's Messenger (ﷺ) in two parts and Allah's Messenger (ﷺ) said:Bear testimony to this
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: 52:27