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

“But do not think of those that have been slain in God's cause as dead. Nay, they are alive! With their Sustainer have they their sustenance,”

Please check ayah 3:175 for complete tafsir.