Qur'an 2:154

وَلَا تَقُولُوا۟ لِمَن يُقْتَلُ فِى سَبِيلِ ٱللَّهِ أَمْوَٰتٌۢ ۚ بَلْ أَحْيَآءٌ وَلَـٰكِن لَّا تَشْعُرُونَ

“And do not say about those who are killed in the way of Allāh, "They are dead." Rather, they are alive, but you perceive [it] not.”

Al-Baqara 2:154 · Saheeh International