Musnad Abu Ya'la al-Mawsili 154:1

Abu Ma'mar Isma'il ibn Ibrahim al-Hudhali narrated to us, Sufyan narrated to us, from 'Amr, from Ibn 'Umar: That he bought camels affected with mange from the partner of an-Nawas, and he found something [wrong] with them. He said: "We are satisfied with the decree of the Messenger of Allah (may Allah bless him and grant him peace): 'There is no contagion.'"