Abdullah bin Masud reported,

I came in to see the Prophet ﷺ while he was suffering from a fever. I placed my hand on him and said, "You are burning with a severe fever."He replied, "I suffer fever as two men among you would."I said, "That must be because you have a double reward."He answered, "Indeed. No believer is afflicted by illness or anything else without Allah causing his sins to fall away because of it, just as a tree sheds its leaves."

Ahmad 4346

Sahih

حدثنا محمد بن عبيد حدثنا الأعمش عن إبراهيم التيمي عن الحارث بن سويد قال

قال عبد الله

دخلت على النبي ﷺ وهو يوعك فوضعت يدي عليه وقلت إنك توعك وعكا شديدا قال إني أوعك كما يوعك رجلان منكم قال قلت ذاك بأن لك أجرين قال أجل ما من مؤمن يصيبه مرض فما سواه إلا حط الله به خطاياه كما تحط الشجرة ورقها

أحمد 4346صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abdullah bin Masud
Numbering
Darussalam 4346
Ahmad 4346