Word by Word Analysis

كَانُوا۟ لَا يَتَنَاهَوْنَ عَن مُّنكَرٍ فَعَلُوهُ ۚ لَبِئْسَ مَا كَانُوا۟ يَفْعَلُونَ 79

They used not to prevent one another from wrongdoing that they did. How wretched was that which they were doing.