Chapter: The obligation to wash away urine and other impurities if they result in the Masjid, and the ground may be purified with water with no need to scrub it
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 Prophet who were present there) shouted, but the Messenger of Allah ( صلی اللہ علیہ وسلم ) said: Leave him alone. When he had finished, the Messenger of Allah ( صلی اللہ علیہ وسلم ) ordered that a bucket (of water) should be brought and poured over it.
Authentic