Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Ata bin Yasar that the Noble Prophet (peace and blessings be upon him) said: When a believing servant falls ill, Allah Almighty commands the noble scribes (angels): Write for My servant the same (good deeds) that he used to do when he was healthy, until I either call him to Myself or grant him relief from that affliction.