(60) باب الْبَوْلِ قَائِمًا وَقَاعِدًا
Narrated Hudhaifa:
Once the Prophet (ﷺ) went to the dumps of some people and passed urine while standing. He then asked for water and so I brought it to him and he performed ablution.
Reference: Sahih al-Bukhari 224
In-book reference: Book 4, Hadith 91
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 224