Quran 5:79 from Surah Al-Maaida on Divine Marvels.
كَانُواْ لَا يَتَنَاهَوۡنَ عَن مُّنكَرٖ فَعَلُوهُۚ لَبِئۡسَ مَا كَانُواْ يَفۡعَلُونَ
English translation: They had been not forbidding each other from wrongdoing they did [it] Surely, evil (was) what they were doing
Transliteration: kanu la yatanahawna an munkarin fa'aluhu labi'sa ma kanu yaf 'aluna