ما كانَ لِأَهلِ المَدينَةِ وَمَن حَولَهُم مِنَ الأَعرابِ أَن يَتَخَلَّفوا عَن رَسولِ اللَّهِ وَلا يَرغَبوا بِأَنفُسِهِم عَن نَفسِهِ ۚ ذٰلِكَ بِأَنَّهُم لا يُصيبُهُم ظَمَأٌ وَلا نَصَبٌ وَلا مَخمَصَةٌ في سَبيلِ اللَّهِ وَلا يَطَئونَ مَوطِئًا يَغيظُ الكُفّارَ وَلا يَنالونَ مِن عَدُوٍّ نَيلًا إِلّا كُتِبَ لَهُم بِهِ عَمَلٌ صالِحٌ ۚ إِنَّ اللَّهَ لا يُضيعُ أَجرَ المُحسِنينَ

It’s not for the inhabitants of the city and the Desert Arabs around them to stay behind God’s Messenger, or to prefer themselves over him. Because they don’t suffer from thirst, fatigue, or hunger striving in the cause of God, nor take a step that infuriates the unbelievers, nor receive anything from an enemy, but it is recorded for them as a righteous deed. Truly, God does not waste the reward of those who do good.