Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates from the Prophet (peace and blessings of Allah be upon him) that whenever Allah Almighty puts a person to a physical trial, then as long as he remains ill, the same deeds are written for him as he used to do in a state of health. If Allah grants the patient recovery, I think the Prophet (peace be upon him) said: "His sins are washed away, and if Allah takes him (in death), He forgives him." And in another narration: "If Allah grants him recovery, He washes him clean of sins."