جامع الترمذي

Abu Hurairah narrated that the Prophet(S.A.W) visited a man who was ill, so he said: "Cheer up, for indeed Allah said: 'It is My Fire which I impose upon My sinning slave as his portion of the Fire." (Hasan) Al-Hasan said: "They would hope that the fever that occurred at night would atone for any deficiency caused by sins."