Commanding Good and Forbidding Evil (Amr bi-al-Ma'ruf wa-Nahy 'an al-Munkar)

كَانُوا۟ لَا يَتَنَاهَوْنَ عَن مُّنكَرٍ فَعَلُوهُ ۚ لَبِئْسَ مَا كَانُوا۟ يَفْعَلُونَ

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