It is narrated from Sayyiduna Abdullah (may Allah be pleased with him), he says: I went to the Noble Prophet (peace and blessings be upon him) and he had a fever. I said to him: O Messenger of Allah! Indeed, you have a very severe fever, what is the reason for this? He (peace and blessings be upon him) said: Yes, indeed I have as much fever as two of you among men. I said: Then is the reward for you also doubled? He (peace and blessings be upon him) said: Yes, by the One in Whose hand is my soul! Whatever pain afflicts a Muslim living on the face of the earth, whether it is illness or any other pain, Allah Almighty wipes out his sins thereby, just as a tree sheds its leaves.