Narrated Ibn `Abbas: The Prophet went to visit a sick bedouin. Whenever the Prophet went to a patient, he used to say to him,   Don't worry, if Allah will, it will be expiation (for your sins):   The bedouin said,   You say expiation? No, it is but a fever that is boiling or harassing an old man and will lead him to his grave without his will.   The Prophet said,   Then, yes, it is so.