Ibn "Umar said: "The Messenger of Allah P.B.U.H said: 'There is no 'Aduxi, no omen, and no Hornak: A man stood up and said: '0 Messenger of Allah, what if a camel has mange and another camel gets mange from it?' He said: 'That is the Divine decree. Who caused the mange in the first one?": (Sahih)