Sahih Muslim 731
صحيح مسلم#731SahihA'isha reported:I and the Messenger (ﷺ) took a bath from the same vessel and our hands alternated into it in the state that we had had sexual intercourse
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: 3:53