Sahih Muslim Book 26, Hadith Number 5507.

Chapter : There is no infection, no evil omen, no Hama, no safar, no star promising rain, no ghoul and the ill should not go to those who are healthy.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: There is no infection, no safar, no hama. A desert Arab said: Allah’s Messenger, how is it that when the camel is in the sand it is like a deer-then a camel afflicted with scab mixes with it and it is affected by sub? He (the Holy Prophet) said: Who infected the first one?