Sayyidah Aishah (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) was struck by severe pain, and he (peace and blessings be upon him) began tossing and turning restlessly on his bed. I said: O Messenger of Allah! If one of us had done this, you would have shown displeasure with him. The Messenger of Allah (peace and blessings be upon him) said: "Indeed, the believer is subjected to hardship, and there is no believer who is struck by a calamity or a pain except that Allah removes a sin from him in return for it and raises his rank." This hadith is sahih (authentic) on the condition of the two Shaykhs, but they did not record it.