You are reading a tafsir for the group of verses 9:120 to 9:121
ما كان لاهل المدينة ومن حولهم من الاعراب ان يتخلفوا عن رسول الله ولا يرغبوا بانفسهم عن نفسه ذالك بانهم لا يصيبهم ظما ولا نصب ولا مخمصة في سبيل الله ولا يطيون موطيا يغيظ الكفار ولا ينالون من عدو نيلا الا كتب لهم به عمل صالح ان الله لا يضيع اجر المحسنين ١٢٠ ولا ينفقون نفقة صغيرة ولا كبيرة ولا يقطعون واديا الا كتب لهم ليجزيهم الله احسن ما كانوا يعملون ١٢١
مَا كَانَ لِأَهْلِ ٱلْمَدِينَةِ وَمَنْ حَوْلَهُم مِّنَ ٱلْأَعْرَابِ أَن يَتَخَلَّفُوا۟ عَن رَّسُولِ ٱللَّهِ وَلَا يَرْغَبُوا۟ بِأَنفُسِهِمْ عَن نَّفْسِهِۦ ۚ ذَٰلِكَ بِأَنَّهُمْ لَا يُصِيبُهُمْ ظَمَأٌۭ وَلَا نَصَبٌۭ وَلَا مَخْمَصَةٌۭ فِى سَبِيلِ ٱللَّهِ وَلَا يَطَـُٔونَ مَوْطِئًۭا يَغِيظُ ٱلْكُفَّارَ وَلَا يَنَالُونَ مِنْ عَدُوٍّۢ نَّيْلًا إِلَّا كُتِبَ لَهُم بِهِۦ عَمَلٌۭ صَـٰلِحٌ ۚ إِنَّ ٱللَّهَ لَا يُضِيعُ أَجْرَ ٱلْمُحْسِنِينَ ١٢٠ وَلَا يُنفِقُونَ نَفَقَةًۭ صَغِيرَةًۭ وَلَا كَبِيرَةًۭ وَلَا يَقْطَعُونَ وَادِيًا إِلَّا كُتِبَ لَهُمْ لِيَجْزِيَهُمُ ٱللَّهُ أَحْسَنَ مَا كَانُوا۟ يَعْمَلُونَ ١٢١
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3

Commentary

The two verses cited above admonish those who missed to join the expedition of Tabuk for no valid reason. They have also been told that they did what was not proper. Then the verses describe the merits of people who take part in Jihad and tell us about the great rewards they get for everything they do there. Included here is the causing of hurt or loss to the enemy and the using of a strategy that infuriates the adversary. All these are good deeds, and worthy of thawab (reward from Allah).