Yahya related to me from Malik that he had heard from Bukayr ibnAbdullah ibn al-Ashajj from Ibn Atiya that the Messenger of Allah, mayAllah bless him and grant him peace, said, "There is no contagion, nohama and no serpent in a hungry belly. However, the possessor of sicklivestock must not stop at the same place as the possessor of healthylivestock, but the possessor of healthy livestock may stop wherever hewishes."They said, "Messenger of Allah, Why is that?" TheMessenger of Allah, may Allah bless him and grant him peace, said, "Itis harmful."
USC-MSA web (English) reference: Book 50, Hadith 18
Arabic reference: Book 50, Hadith 1732