Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Bara’ bin ‘Azib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: “Whenever a vein or an eye is harmed, it is due to some sin, but the pains that Allah, the Exalted, keeps averting (from a person) are much more.”

It is narrated from Sayyiduna Uqbah bin Amir al-Juhani, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "There is no deed on any day except that the doer’s end is upon that deed. (Its explanation is that) when a believer becomes ill, the angels say to Allah Almighty: 'O our Lord! You have prevented so-and-so servant (from performing deeds).' (So what should be done about his good deeds?) Allah Almighty replies: 'Count for this servant the same deeds as he used to do (before falling ill), until he recovers or passes away.'"