Surah Al-Imran, ayah 169

3:169

وَلَا تَحۡسَبَنَّ ٱلَّذِينَ قُتِلُواْ فِي سَبِيلِ ٱللَّهِ أَمۡوَٰتَۢاۚ بَلۡ أَحۡيَآءٌ عِندَ رَبِّهِمۡ يُرۡزَقُونَ ١٦٩

Walā tahsabannal-ladhīna qutilū fī sabīlillāhi amwātā bal ahyā'un 'inda rabbihim yurzaqūn

And never think of those who have been killed in the cause of Allāh as dead. Rather, they are alive with their Lord, receiving provision,