Surah At-Tawbah, ayah 120

مَا كَانَ لِأَهۡلِ ٱلۡمَدِينَةِ وَمَنۡ حَوۡلَهُم مِّنَ ٱلۡأَعۡرَابِ أَن يَتَخَلَّفُواْ عَن رَّسُولِ ٱللَّهِ وَلَا يَرۡغَبُواْ بِأَنفُسِهِمۡ عَن نَّفۡسِهِۦۚ ذَٰلِكَ بِأَنَّهُمۡ لَا يُصِيبُهُمۡ ظَمَأٞ وَلَا نَصَبٞ وَلَا مَخۡمَصَةٞ فِي سَبِيلِ ٱللَّهِ وَلَا يَطَـُٔونَ مَوۡطِئٗا يَغِيظُ ٱلۡكُفَّارَ وَلَا يَنَالُونَ مِنۡ عَدُوّٖ نَّيۡلًا إِلَّا كُتِبَ لَهُم بِهِۦ عَمَلٞ صَٰلِحٌۚ إِنَّ ٱللَّهَ لَا يُضِيعُ أَجۡرَ ٱلۡمُحۡسِنِينَ ١٢٠

Mā kāna li ahlil-madīnati waman hawlahum minal-a'rābi an yatakhallafū 'ar rasūlillāhi walā yarghabū bi anfusihim 'an nafsihī dhālika bi annahum lā yusībuhum zama'un walā nasabun walā makhmasatun fī sabīlillāhi walā yata'ūna mawti'an yaghīzul-kuffāra walā yanālūna min 'aduwwin naylan illā kutiba lahum bihī 'amalun sālihun innallāha lā yudī'u ajral-muhsinīn

It was not [proper] for the people of Madīnah and those surrounding them of the bedouins that they remain behind after [the departure of] the Messenger of Allāh or that they prefer themselves over his self.⁵⁰⁷ That is because they are not afflicted by thirst or fatigue or hunger in the cause of Allāh, nor do they tread on any ground that enrages the disbelievers, nor do they inflict upon an enemy any infliction but that it is registered for them as a righteous deed. Indeed, Allāh does not allow to be lost the reward of the doers of good.