(61) باب الْبَوْلِ عِنْدَ صَاحِبِهِ وَالتَّسَتُّرِ بِالْحَائِطِ
Narrated Hudhaifa':
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.
Reference: Sahih al-Bukhari 225
In-book reference: Book 4, Hadith 92
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 225