I visited Messenger of Allah ﷺ while he was suffering from a high fever. I touched him with my hand and said, "O Messenger of Allah ﷺ! You have a high fever." Messenger of Allah ﷺ said, "Yes, I have as much fever as two men of you have." I said, "Is it because you will get a double reward?" Messenger of Allah ﷺ said, "Yes, no Muslim is afflicted with harm because of sickness or some other inconvenience, but that Allah will remove his sins for him as a tree sheds its leaves."
دَخَلْتُ عَلَى رَسُولِ اللَّهِ ﷺ وَهْوَ يُوعَكُ۔ فَمَسِسْتُهُ بِيَدِي فَقُلْتُ: يَا رَسُولَ اللَّهِ إِنَّكَ تُوعَكُ وَعْكًا شَدِيدًا! فَقَالَ رَسُولُ اللَّهِ ﷺ: «أَجَلْ، إِنِّي أُوعَكُ كَمَا يُوعَكُ رَجُلاَنِ مِنْكُمْ فَقُلْتُ ذَلِكَ أَنَّ لَكَ أَجْرَيْنِ فَقَالَ رَسُولُ اللَّهِ ﷺ أَجَلْ ثُمَّ قَالَ رَسُولُ اللَّهِ ﷺ مَا مِنْ مُسْلِمٍ يُصِيبُهُ أَذًى مَرَضٌ فَمَا سِوَاهُ إِلاَّ حَطَّ اللَّهُ لَهُ سَيِّئَاتِهِ كَمَا تَحُطُّ الشَّجَرَةُ وَرَقَهَا