It is narrated from Hazrat Anas (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) was sitting in the mosque with his companions (may Allah be pleased with them), when a Bedouin came and began to urinate in the mosque. The companions (may Allah be pleased with them) tried to stop him to warn him, but the Prophet (peace and blessings be upon him) said, "Do not stop him, let him be." After he had finished, the Prophet (peace and blessings be upon him) called him and said, "It is not appropriate to have any kind of filth, urine, or feces in these mosques. These mosques are for the recitation of the Holy Qur'an, remembrance of Allah, and prayer." Then the Prophet (peace and blessings be upon him) told a man, "Go and bring a bucket of water and pour it over it." So that man brought a bucket of water and poured it over the urine.