Sunan an-Nasa'i 396
سنن النسائي#396SahihAbu Hurairah said:"The Messenger of Allah (ﷺ) said: 'None of you should perform ghusl in standing water while he is Junub
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: 4:1