Hadith-e-Qudsi 22 — Reward for Sick Believers
Narrated Uqba bin Aamir (may Allah be pleased with him), the Prophet ﷺ said: “Every deed of a day is sealed up. When a believer falls ill, the angels say: ‘O our Lord! Your slave so-and-so has fallen ill.’ The Lord the Glorious and Majestic, says: ‘Note down to his credit the same deeds, he was doing before illness, until he heals up or dies.’”
عن عقبة بن عامر رضي الله عنه عن النبي صلى الله عليه وسلم أنه قال: ليس من عمل يوم إلا وهو يختم عليه، فإذا مرض المؤمن قالت الملائكة: يا ربنا عبدك فلان قد حبسته، فيقول الرب عز وجل: اختموا له على مثل عمله حتى يبرأ أو يموت
[Musnad Ahmad: 146/4]