It is narrated from Abdur Rahman bin Saeed, who narrates from his father, that I was with Sayyiduna Salman al-Farsi (may Allah be pleased with him). He visited a sick person in Kindah. When he came to the patient, he said to him: Rejoice, for indeed the illness of a believer, Allah the Exalted makes it an expiation for his sins and a means of attaining the pleasure of Allah. And the illness of a sinful, wicked person is like a camel which its family has tied up, then released; it does not know why it was tied up nor why it was released.