(56) باب مَا جَاءَ فِي غَسْلِ الْبَوْلِ
Narrated Anas bin Malik:
Whenever the Prophet (ﷺ) went to answer the call of nature, I used to bring water with which he used to clean his private parts.
Reference: Sahih al-Bukhari 217
In-book reference: Book 4, Hadith 83
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 4, Hadith 216