Sunan an-Nasa'i 27
سنن النسائي#27SahihIt was narrated that Mansur said:"I heard Abu Wa'il (say) that Hudhaifah said: 'The Messenger of Allah (ﷺ) came to some people's garbage dump and urinated while standing
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 - Agreed Upon
In-book reference: 1:27