Volume 7, Book 70, Number 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 inconveni –
ence, but that Allah will remove his sins as a tree sheds its leaves.”