Sunan an-Nasa'i 398
سنن النسائي#398SahihIt was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) forbade urinating into standing water and then performing Ghusl from Janabah in it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahHasan Sahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 4:3