An-Nisa 4:74

Falyuqatil fee sabeeli Allahiallatheena yashroona alhayata addunyabil-akhirati waman yuqatil fee sabeeli Allahifayuqtal aw yaghlib fasawfa nu/teehi ajran AAatheema

So let those fight in the cause of Allāh who sell the life of this world for the Hereafter. And he who fights in the cause of Allāh and is killed or achieves victory - We will bestow upon him a great reward.

So, those who sell the worldly life for the Hereafter should fight in the way of Allah. Whoever fights in the way of Allah, then gets killed or prevails, We shall give a great reward to him.