Musnad Ahmad 33:1180

'Ali ibn Bahr narrated to us, 'Isa narrated to us, al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: I heard the Prophet, peace and blessings of Allah be upon him, saying: "There is no Muslim man, nor Muslim woman, nor believing man, nor believing woman, who is afflicted with an illness, except that Allah removes some of his sins from him."