Example in the Quran

وَلَا تَقُولُواْ لِمَن يُقۡتَلُ فِي سَبِيلِ ٱللَّهِ أَمۡوَٰتُۢۚ بَلۡ أَحۡيَآءٞ وَلَٰكِن لَّا تَشۡعُرُونَ

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