Sahih al-Bukhari 225
Sahih al-Bukhari · Book 4: Ablutions (Wudu') · To urinate beside one's companion while screened by a wall
Narrated Hudhaifa':
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ ، قَالَ حَدَّثَنَا جَرِيرٌ ، عَنْ مَنْصُورٍ ، عَنْ أَبِي وَائِلٍ ، عَنْ حُذَيْفَةَ ، قَالَ رَأَيْتُنِي أَنَا وَالنَّبِيُّ، صلى الله عليه وسلم نَتَمَاشَى، فَأَتَى سُبَاطَةَ قَوْمٍ خَلْفَ حَائِطٍ، فَقَامَ كَمَا يَقُومُ أَحَدُكُمْ فَبَالَ، فَانْتَبَذْتُ مِنْهُ، فَأَشَارَ إِلَىَّ فَجِئْتُهُ، فَقُمْتُ عِنْدَ عَقِبِهِ حَتَّى فَرَغَ.
The Prophet (ﷺ) and I walked till we reached the dumps of some people. He stood, as any one of you stands, behind a wall and urinated. I went away, but he beckoned me to come. So I approached him and stood near his back till he finished.