Musnad Abu Ya'la al-Mawsili 123:6

Abu Khaythama narrated to us, Yazid narrated to us, Yahya bin Sa'id informed us, from Anas, who said: A Bedouin entered upon the Messenger of Allah (may Allah bless him and grant him peace), then he stood at a side of the mosque and shouted. The people shouted at him, but the Messenger of Allah (may Allah bless him and grant him peace) restrained them until he had finished. Then he called for a bucket of water and poured it over the urine of the Bedouin.