3:168
ٱلَّذِينَ قَالُوا۟ لِإِخْوَٰنِهِمْ وَقَعَدُوا۟ لَوْ أَطَاعُونَا مَا قُتِلُوا۟ ۗ قُلْ فَٱدْرَءُوا۟ عَنْ أَنفُسِكُمُ ٱلْمَوْتَ إِن كُنتُمْ صَـٰدِقِينَ
alladhīna qālū li-ikh'wānihim waqaʿadū law aṭāʿūnā mā qutilū qul fa-id'raū ʿan anfusikumu l-mawta in kuntum ṣādiqīna
As for those who stayed behind, and said of their brothers, ‘If only they had listened to us, they would not have been killed,’ tell them [Prophet], ‘Ward off death from yourselves, if what you say is true.’
(They are) the ones who said about their killed brethren while they themselves sat (at home): "If only they had listened to us, they would not have been killed." Say: "Avert death from your ownselves, if you speak the truth."