Sahih Muslim | Book 26 | Hadith Number 5495

Narrated by Usama
Usama reported Allah's Messenger (may peace be upon him) as saying: Plague is a calamity which was inflicted on those who were before you, or upon Bani Isra'il. So when it has broken out in a land, don't run out of it, and when it has spread in a land, then don't enter it.