Surah Ali'Imran, Verse 157

وَلَئِن قُتِلۡتُمۡ فِي سَبِيلِ ٱللَّهِ أَوۡ مُتُّمۡ لَمَغۡفِرَةٞ مِّنَ ٱللَّهِ وَرَحۡمَةٌ خَيۡرٞ مِّمَّا يَجۡمَعُونَ١٥٧

wala-in qutil'tum fī sabīli l-lahi aw muttum lamaghfiratun mina l-lahi waraḥmatun khayrun mimmā yajmaʿūna

And if you are killed in the cause of Allāh or die - then forgiveness from Allāh and mercy are better than whatever they accumulate [in this world].