Surah Ali 'Imran 3:168

ٱلَّذِينَ قَالُوا۟ لِإِخْوَٰنِهِمْ وَقَعَدُوا۟ لَوْ أَطَاعُونَا مَا قُتِلُوا۟ ۗ قُلْ فَٱدْرَءُوا۟ عَنْ أَنفُسِكُمُ ٱلْمَوْتَ إِن كُنتُمْ صَـٰدِقِينَ

Those who said about their brothers while sitting [at home], "If they had obeyed us, they would not have been killed." Say, "Then prevent death from yourselves, if you should be truthful."

Translation: Saheeh International

Tafsir

Those who alladhīna substitutes for the previous alladhīna or constitutes an adjectival qualification of it said to their brothers in religion whilst they themselves had stayed put refraining from joining the struggle ‘Had they the martyrs at Uhud or those who stayed put with us obeyed us they would not have been …

Excerpt from Tafsir al-Jalalayn, commentary on 3:168, via Quran.com. The reader has the full commentary and 9 more tafsirs.