Narrated Abu Huraira: The Messenger of Allah (ﷺ) said, “There is no contagion (‘adwa), nor is there any vermin calling for revenge (hamah), nor is there a serpent in the belly (safar). The owner of sick livestock, however, must not stop at the same place as the owner of healthy livestock, but the owner of healthy livestock may stop wherever he wishes.” They said, “Messenger of Allah, Why is that?” The Messenger of Allah (ﷺ) said, “(Because) it is harmful.”