يا أَيُّهَا الَّذينَ آمَنوا لا تَكونوا كَالَّذينَ كَفَروا وَقالوا لِإِخوانِهِم إِذا ضَرَبوا فِي الأَرضِ أَو كانوا غُزًّى لَو كانوا عِندَنا ما ماتوا وَما قُتِلوا لِيَجعَلَ اللَّهُ ذٰلِكَ حَسرَةً في قُلوبِهِم ۗ وَاللَّهُ يُحيي وَيُميتُ ۗ وَاللَّهُ بِما تَعمَلونَ بَصيرٌ

O you who have believed, do not be like those who disbelieved and said about their brothers when they traveled through the land or went out to fight, "If they had been with us, they would not have died or have been killed," so Allah makes that [misconception] a regret within their hearts. And it is Allah who gives life and causes death, and Allah is Seeing of what you do.