Narrated 'Abdullah:

I visited Allah's Apostle while he was suffering from a high fever. I said, "O Allah's Apostle! You have a high fever." He said, "Yes, I have as much fever as two men of you." I said, "Is it because you will have a double reward?" He said, "Yes, it is so. No Muslim is afflicted with any harm, even if it were the prick of a thorn, but that Allah expiates his sins because of that, as a tree sheds its leaves."

حَدَّثَنَا عَبْدَانُ، عَنْ أَبِي حَمْزَةَ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ التَّيْمِيِّ، عَنِ الْحَارِثِ بْنِ سُوَيْدٍ، عَنْ عَبْدِ اللَّهِ، قَالَ دَخَلْتُ عَلَى رَسُولِ اللَّهِ ﷺ وَهْوَ يُوعَكُ فَقُلْتُ يَا رَسُولَ اللَّهِ إِنَّكَ تُوعَكُ وَعْكًا شَدِيدًا. قَالَ " أَجَلْ إِنِّي أُوعَكُ كَمَا يُوعَكُ رَجُلاَنِ مِنْكُمْ ". قُلْتُ ذَلِكَ أَنَّ لَكَ أَجْرَيْنِ قَالَ " أَجَلْ ذَلِكَ كَذَلِكَ، مَا مِنْ مُسْلِمٍ يُصِيبُهُ أَذًى شَوْكَةٌ فَمَا فَوْقَهَا، إِلاَّ كَفَّرَ اللَّهُ بِهَا سَيِّئَاتِهِ، كَمَا تَحُطُّ الشَّجَرَةُ وَرَقَهَا ".