Quran Al-An'am 6:123
وَكَذَٰلِكَ جَعَلۡنَا فِي كُلِّ قَرۡيَةٍ أَكَٰبِرَ مُجۡرِمِيهَا لِيَمۡكُرُواْ فِيهَاۖ وَمَا يَمۡكُرُونَ إِلَّا بِأَنفُسِهِمۡ وَمَا يَشۡعُرُونَ ١٢٣
Translation
And thus We have placed within every city the greatest of its criminals to conspire therein. But they conspire not except against themselves, and they perceive [it] not.