سورة Al-Baqarah 2:154

وَلَا تَقُولُوا۟ لِمَن يُقْتَلُ فِى سَبِيلِ ٱللَّهِ أَمْوَٰتٌۢ ۚ بَلْ أَحْيَآءٌۭ وَلَـٰكِن لَّا تَشْعُرُونَ ١٥٤

Never say that those martyred in the cause of Allah are dead—in fact, they are alive! But you do not perceive it