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Bukhari :: Book 7 :: Volume 70 :: Hadith 571

Narrated Ibn Mas'ud:

I visited the Prophet while he was having a high fever. I touched him an said, "You have a very high fever" He said, "Yes, as much fever as two me of you may have." I said. "you will have a double reward?" He said, "Yes No Muslim is afflicted with hurt caused by disease or some other inconvenience, but that Allah will remove his sins as a tree sheds its leaves."