Sahih Muslim | Book 26 | Hadith Number 5507
Narrated by Abu Huraira
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?