Sunan an-Nasa'i 399
سنن النسائي#399SahihIt was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) forbade urinating into standing water then performing Ghusl with it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 4:4