Bukhari :: Book 7 :: Volume 71 :: Hadith 630
(the wife of the Prophet) that she asked Allah's Apostle about plague, and Allah's Apostle informed her saying, "Plague was a punishment which Allah used to send on whom He wished, but Allah made it a blessing for the believers. None (among the believers) remains patient in a land in which plague has broken out and considers that nothing will befall him except what Allah has ordained for him, but that Allah will grant him a reward similar to that of a martyr."
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