(7) باب قضاء الحاجة
Narrated Anas (rad):
Whenever Allah's Messenger (ﷺ) went to the privy, a servant and I used to carry a skin water container and a spear, and he would cleanse himself with the water. [Agreed upon].
Reference: Bulugh al-Maram 89
In-book reference: Book 1, Hadith 107
English translation: Book 1, Hadith 95