In the name of Allah, Most Gracious, Most Merciful.
Narrated Abdullah ibn Masoud (may Allah be pleased with him): ‘I visited Allah’s Messenger (SAWS) while he was suffering from a high fever. I said: “O Allah’s Messenger (SAWS)! You have a high fever”. He said: “Yes. I have as much fever as two men of you.” I said: “Is it because you will have a double reward?” He said: “Yes. It is so. No Muslim is afflicted with any harm, even if it were the prick of a thorn, but that Allah expiates his sins because of it, as a tree sheds its leaves.”‘ (Bukhari)
SAWS: May Allah exalt his mention and protect him from imperfection
Riyaadiss-Saliheen (The Meadows of the Righteous) (Abridged)
By Imam An Nawawi Vol. (2)
Publisher: Dar Al-Manarah
Chapter 140, Page 639, Number 469