سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 27
The Book of Purification
Allowing one To Urinate While Standing In A Desolate Area
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ أَنْبَأَنَا مُحَمَّدٌ، قَالَ أَنْبَأَنَا شُعْبَةُ، عَنْ مَنْصُورٍ، قَالَ سَمِعْتُ أَبَا وَائِلٍ، أَنَّ حُذَيْفَةَ، قَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَتَى سُبَاطَةَ قَوْمٍ فَبَالَ قَائِمًا .
It 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.'"
Sunan an-Nasa'i, 27Sahih (Darussalam)