It was narrated from Anas bin Malik that:
A Bedouin urinated in the mosque, and some of the people rushed at him. The Messenger of Allah said: "Do not interrupt him." Then he called for a bucket of water and poured it over (the urine). (IT)
English reference (IT): Vol. 1, Book 1, Hadith 528 (IT)
Arabic reference (IT): Book 1, Hadith 571 (IT)