Al-Adab Al-Mufrad #495

'Abdu'r-Rahman ibn Sa'id reported that his father said, "I waswith Salman when he visited a sick person in Kinda. When he went in, he said, 'Good news! Allah makes the illness of the believer an expiation for him and a restoration, whereas the illness of the corrupt person is like a camel whose people hobble it and the let it go. It does not know why it was hobbled or released.'"