Surah Ali 'Imran (3:169)

وَلَا تَحْسَبَنَّ ٱلَّذِينَ قُتِلُوا۟ فِى سَبِيلِ ٱللَّهِ أَمْوَٰتًۢا بَلْ أَحْيَآءٌ عِندَ رَبِّهِمْ يُرْزَقُونَ

And do not ever reckon those who have been killed in the path of Allah as dead; rather, they are living, with their Lord, being provided for.