Sura Muḥammad 47:4

فَإِذَا لَقِيتُمُ ٱلَّذِينَ كَفَرُوا۟ فَضَرْبَ ٱلرِّقَابِ حَتَّىٰٓ إِذَآ أَثْخَنتُمُوهُمْ فَشُدُّوا۟ ٱلْوَثَاقَ فَإِمَّا مَنًّۢا بَعْدُ وَإِمَّا فِدَآءً حَتَّىٰ تَضَعَ ٱلْحَرْبُ أَوْزَارَهَا ذَٰلِكَ وَلَوْ يَشَآءُ ٱللَّـهُ لَٱنتَصَرَ مِنْهُمْ وَلَٰكِن لِّيَبْلُوَا۟ بَعْضَكُم بِبَعْضٍ وَٱلَّذِينَ قُتِلُوا۟ فِى سَبِيلِ ٱللَّـهِ فَلَن يُضِلَّ أَعْمَٰلَهُمْ

fa-idhā laqītumu lladhīna kafarū fa-ḍarba l-riqābi ḥatta idhā athkhantumūhum fa-shuddū l-wathāqa fa-immā mannan baʿdu wa-immā fidāʾan ḥattā taḍaʿa l-ḥarbu awzārahā dhālika wa-law yashāʾu allāhu la-intaṣara minhum wa-lākin li-yabluwā baʿḍakum bi-baʿḍin wa-lladhīna qutilū fī sabīli allāhi fa-lan yuḍilla aʿmālahum

Therefore, when ye meet the Unbelievers (in fight), smite at their necks; At length, when ye have thoroughly subdued them, bind a bond firmly (on them): thereafter (is the time for) either generosity or ransom: Until the war lays down its burdens. Thus (are ye commanded): but if it had been Allah's Will, He could certainly have exacted retribution from them (Himself); but (He lets you fight) in order to test you, some with others. But those who are slain in the Way of Allah,- He will never let their deeds be lost.