Sahih Muslim 2770
صحيح مسلم#2770SahihAbu Sa'id al-Khudri (Allah be pleased with him) reported that the Messenger of Allah (ﷺ) devoted (himself to prayer) in the middle (ten nights) of Ramadan. The rest of the hadith is the same except for these words:" That he adhered to his place of i'tikaf and his forehead was besmeared with mud and water
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: 13:276