Sahih Muslim 2788
صحيح مسلم#2788SahihA'isha (Allah be pleased with her) reported that Allah's Messenger (ﷺ) used to exert himself in devotion during the last ten nights to a greater extent than at any other time
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: 14:9