Sahih Muslim | Book 2 | Chapter 22

Narrated by Anas
Anas reported: A Bedouin urinated in the mosque. Some of the persons stood up (to reprimand him or to check him from doing so), but the Messenger of Allah (may peace be upon him) said: Leave him alone; don't interrupt him. He (the narrator) said: And when he had finished, he called for a bucket of water and poured it over.

Narrated by Anas b. Malik
Anas b. Malik narrated that a desert Arab (Bedouin) stood in a corner of the mosque and urinated there. The people (the Companions of the Holy Prophet who were present there)

shouted, but the Messenger of Allah (may peace be upon him) said: Leave him alone. When he had finished, the Messenger of Allah (may peace be upon him) ordered that a bucket (of water) should be brought and poured over it.

Narrated by Anas b. Malik
Anas b. Malik reported: While we were in the mosque with Allah's Messenger (may peace be upon him), a desert Arab came and stood up and began to urinate in the mosque. The Companions of Allah's Messenger (may peace be upon him) said: Stop, stop, but the Messenger of Allah (may peace be upon him) said: Don't interrupt him; leave him alone. They left him alone, and when he finished urinating, Allah's Messenger (may peace be upon him) called him and said to him: These mosques are not the places meant for urine and filth, but are only for the remembrance of Allah, prayer and the recitation of the Qur'an, or Allah's Messenger said something like that. He (the narrator) said that he (the Holy Prophet) then gave orders to one of the people who brought a bucket of water and poured It over.