مَا كَانَ لِأَهْلِ الْمَدِينَةِ وَمَنْ حَوْلَهُم مِّنَ الْأَعْرَابِ أَن يَتَخَلَّفُوا عَن رَّسُولِ اللَّهِ وَلَا يَرْغَبُوا بِأَنفُسِهِمْ عَن نَّفْسِهِ ۚ ذَٰلِكَ بِأَنَّهُمْ لَا يُصِيبُهُمْ ظَمَأٌ وَلَا نَصَبٌ وَلَا مَخْمَصَةٌ فِي سَبِيلِ اللَّهِ وَلَا يَطَئُونَ مَوْطِئًا يَغِيظُ الْكُفَّارَ وَلَا يَنَالُونَ مِنْ عَدُوٍّ نَّيْلًا إِلَّا كُتِبَ لَهُم بِهِ عَمَلٌ صَالِحٌ ۚ إِنَّ اللَّهَ لَا يُضِيعُ أَجْرَ الْمُحْسِنِينَ (120)
(9:120) It did not behove the people of Al-Madinah and the Bedouins, dwelling around, to abandon Allah's Messenger and stay at home in order to safeguard their own interests, in utter disregard of him. For, every hardship like thirst, hunger and any other physical ordeal they suffer in the Way of Allah, and every step they take on that Way which enrages the unbelievers, and every act of wreaking vengeance upon the enemies of the truth, is credited in their favour with a good deed for each: surely Allah does not let go unrewarded any deed of the righteous people.