Surah Al-Imran, ayah 157

وَلَئِن قُتِلۡتُمۡ فِي سَبِيلِ ٱللَّهِ أَوۡ مُتُّمۡ لَمَغۡفِرَةٞ مِّنَ ٱللَّهِ وَرَحۡمَةٌ خَيۡرٞ مِّمَّا يَجۡمَعُونَ ١٥٧

Wala'in qutiltum fī sabīlillāhi aw muttum lamaghfiratum minallāhi warahmatun khayrum mimmā yajma'ūn

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].