Sahih Muslim 657
صحيح مسلم#657SahihHammam b. Munabbih said:Of the ahadith narrated to us by Abfi Huraira from Muhammad the Messenger of Allah (ﷺ) one is this: The Messenger or Allah (ﷺ) said: You should not urinate in standing water, that is not flowing, 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: 2:123