The Messenger of Allah (ﷺ) visited me while I was sick. He said: Be glad, Umm al-Ala' for Allah removes the sins of a Muslim for his illness as fire removes the dross of gold and silver.
Sunan Abi Dawud Book 21, Hadith 4
← Previous Hadith I heard the Prophet (ﷺ) many times say: When a servant of Allah is accustomed to do a good work, then becomes ill or goes on journey, what was accustomed to do when he was well and staying at home will be recorded for him.

Sunan Abi Dawud Book 21, Hadith 3 Next Hadith → I said: Messenger of Allah, I know the severest verse in the Qur'an. He asked: What is that verse. A'ishah? She replied: Allah's words: "If anyone does evil, he will be requited for it." He said: Do you know A'ishah, that when a believer is afflicted with a calamity or a thorn, it serves as an atonement for his evil deed. He who is called to account will be punished. She said: Does Allah not say: "He truly will recieve an easy reckoning." He said: This is the presentation, A'ishah. If anyone criticized in reckoning, he will be punished.

Abu Dawud said: This is the version of Ibn Bashshar. He said: Ibn Abi Mulaikah narrated to us.

Sunan Abi Dawud Book 21, Hadith 5