Sahih Muslim 656
صحيح مسلم#656SahihAbu Huraira reported:the Messenger of Allah (ﷺ) said: None amongst you should urinate in standing water, and then wash in it
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: 2:122