Sahih Muslim 2590
صحيح مسلم#2590SahihA'isha, the wife of the Messenger of Allah (ﷺ), said:The dawn broke upon the Messenger of Allah (ﷺ) during the Ramadan in a state of junub not because of sexual dream (but on account of intercourse) and he washed himself and observed fast
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: 13:96