The Prophet ﷺ said, "No fatigue, nor disease, nor sorrow, nor sadness, nor hurt, nor distress befalls a Muslim, even if it were the prick from a thorn, except that Allah expiates some of his sins for that."  

عَنِ النَّبِيِّ ﷺ قَالَ: «مَا يُصِيبُ الْمُسْلِمَ مِنْ نَصَبٍ، وَلاَ وَصَبٍ، وَلاَ هَمٍّ، وَلاَ حُزْنٍ، وَلاَ أَذًى، وَلاَ غَمٍّ، حَتَّى الشَّوْكَةِ يُشَاكُهَا، إِلاَّ كَفَّرَ اللَّهُ بِهَا مِنْ خَطَايَاهُ۔»  

I entered upon the Messenger of Allah ﷺ while he was suffering from a high fever. I said, "O Messenger of Allah ﷺ, you have a very 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 the prick of a thorn or something greater except that Allah expiates his sins because of it just as a tree sheds its leaves."  

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۔»  

On the day of Hunayn, the Messenger of Allah ﷺ showed preference (to some) people in the distribution of the spoils. He bestowed on Aqra' b. Habis one hundred camels, and bestowed an equal (number) upon 'Uyaina, and bestowed on people among the elites of Arabia, and preferred them (to others) on that day, in the distribution (of spoils). Upon this a person said: By Allah, neither justice has been done in this distribution (of spoils), nor has the pleasure of Allah been sought in it. I (the narrator ) said: By Allah, I will certainly inform the Messenger of Allah ﷺ about it. I came to him and informed him about what he had said. The color of his (the Prophet's) face changed red like blood and he then said: "Who would do justice, if Allah and His Messenger do not do justice?" He further said: "May Allah have mercy upon Moses; he was tormented more than this, but he showed patience." I said: Never would I convey him (the Holy Prophet) after this (unpleasant) narration.  

لَمَّا كَانَ يَوْمُ حُنَيْنٍ آثَرَ رَسُولُ اللَّهِ ﷺ نَاسًا فِي الْقِسْمَةِ، فَأَعْطَى الأَقْرَعَ بْنَ حَابِسٍ مِائَةً مِنَ الإِبِلِ، وَأَعْطَى عُيَيْنَةَ مِثْلَ ذَلِكَ، وَأَعْطَى أُنَاسًا مِنْ أَشْرَافِ الْعَرَبِ وَآثَرَهُمْ يَوْمَئِذٍ فِي الْقِسْمَةِ۔ فَقَالَ رَجُلٌ: وَاللَّهِ إِنَّ هَذِهِ لَقِسْمَةٌ مَا عُدِلَ فِيهَا وَمَا أُرِيدَ فِيهَا وَجْهُ اللَّهِ۔ قَالَ فَقُلْتُ: وَاللَّهِ لأُخْبِرَنَّ رَسُولَ اللَّهِ ﷺ۔ قَالَ فَأَتَيْتُهُ فَأَخْبَرْتُهُ بِمَا قَالَ قَالَ فَتَغَيَّرَ وَجْهُهُ حَتَّى كَانَ كَالصِّرْفِ ثُمَّ قَالَ: «فَمَنْ يَعْدِلُ إِنْ لَمْ يَعْدِلِ اللَّهُ وَرَسُولُهُ؟» قَالَ ثُمَّ قَالَ: «يَرْحَمُ اللَّهُ مُوسَى قَدْ أُوذِيَ بِأَكْثَرَ مِنْ هَذَا فَصَبَرَ۔» قَالَ قُلْتُ: لاَ جَرَمَ لاَ أَرْفَعُ إِلَيْهِ بَعْدَهَا حَدِيثًا۔