Silsilah as-Sahihah 1675 — Illness and trials are expiation for sins

It is narrated from Sayyiduna Abdur Rahman bin Azhar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The example of a believing servant, when he is afflicted with fever, is like that of iron which is thrown into the fire; its impurities are removed and the useful part remains."