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Bukhari :: Book 7 :: Volume 70 :: Hadith 565

Narrated 'Abdullah:

I visited the Prophet during his illness and touched him while he was having a fever. I said to him, "You have a high fever; is it because you will get a double reward?" He said, "Yes. No Muslim is afflicted with any harm, but that his sins will be annulled as the leave of a tree fall down."