Musnad Abu Ya'la al-Mawsili 243:63

Ibrahim ibn Sa'id al-Jawhari narrated to us, Ali ibn 'Asim narrated to us, from Khalid, from Tawbah al-'Anbari, from Abu Burdah ibn Abi Musa, from his father, Abu Musa, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "A man from the Children of Israel was more severe regarding urine than you are. He had a scraping tool with him; if urine touched any part of his body, he would scrape it off with it."