Mu’adh narrates that he came to visit Sayyiduna Abu Darda’ (may Allah be pleased with him), and when he greeted him with salam, he (Abu Darda’) said: Remain with health, not with illness, and he supplicated this three times. Then he said: I heard the Messenger of Allah (peace and blessings be upon him) say: A Muslim remains afflicted with fever and headaches and similar illnesses, while he has sins as great as Mount Uhud, but because of these illnesses, his sins fall away from him such that not even the weight of a mustard seed of sin remains upon him.