(1) باب المياه
Narrated Anas bin Malik:
Narrated Anas bin Malik (rad): A Bedouin came and urinated in one corner of the mosque and the people shouted at him, but Allah's Messenger (ﷺ) stopped them, and when he finished urinating, the Prophet (ﷺ) ordered for a bucket of water which was spilt over it [Agreed upon].
Reference: Bulugh al-Maram 12
In-book reference: Book 1, Hadith 15
English translation: Book 1, Hadith 14