Sahih Muslim 738
صحيح مسلم#738SahihSafina reported:The Messenger of Allah (ﷺ) took a bath with one Sa` of water because of sexual intercourse and performed ablution with one Mudd
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: 3:60