Sahih Muslim | Book 20 | Hadith Number 4709

Narrated by It has been narrated on the authority of Hafsa daughter of Sirin who
It has been narrated on the authority of Hafsa daughter of Sirin who said: Anas b. Malik asked me the cause of death of Yahya b. 'Abu 'Amra. I said: (He died) of plague. He said: The Messenger of Allah (may peace be upon him) said that death by plague is martyrdom for a Muslim.