مَا كَانَ لِأَهْلِ الْمَدِينَةِ وَمَنْ حَوْلَهُمْ مِنَ الْأَعْرَابِ أَنْ يَتَخَلَّفُوا عَنْ رَسُولِ اللَّهِ وَلَا يَرْغَبُوا بِأَنْفُسِهِمْ عَنْ نَفْسِهِ ۚ ذَٰلِكَ بِأَنَّهُمْ لَا يُصِيبُهُمْ ظَمَأٌ وَلَا نَصَبٌ وَلَا مَخْمَصَةٌ فِي سَبِيلِ اللَّهِ وَلَا يَطَئُونَ مَوْطِئًا يَغِيظُ الْكُفَّارَ وَلَا يَنَالُونَ مِنْ عَدُوٍّ نَيْلًا إِلَّا كُتِبَ لَهُمْ بِهِ عَمَلٌ صَالِحٌ ۚ إِنَّ اللَّهَ لَا يُضِيعُ أَجْرَ الْمُحْسِنِينَ

Surah At-Tawbah : 120
It was not [proper] for the people of Madinah and those surrounding them of the bedouins that they remain behind after [the departure of] the Messenger of Allah or that they prefer themselves over his self. That is because they are not afflicted by thirst or fatigue or hunger in the cause of Allah, nor do they tread on any ground that enrages the disbelievers, nor do they inflict upon an enemy any infliction but that is registered for them as a righteous deed. Indeed, Allah does not allow to be lost the reward of the doers of good.

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