Sayyiduna Uqbah bin Amir (may Allah be pleased with him) reported from the Messenger of Allah (peace and blessings be upon him) that he (peace and blessings be upon him) said: "The deeds of every day are sealed. Then, when a believer falls ill, the angels say: 'O our Lord! You have held back Your servant so-and-so.' Allah Almighty says: 'Keep recording for him the like of his former deeds until he recovers or dies.'"
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14854