Surah Al-An'aam, Verse 123
وَكَذَٰلِكَ جَعَلْنَا فِى كُلِّ قَرْيَةٍ أَكَٰبِرَ مُجْرِمِيهَا لِيَمْكُرُوا۟ فِيهَا ۖ وَمَا يَمْكُرُونَ إِلَّا بِأَنفُسِهِمْ وَمَا يَشْعُرُونَ
Translation — Sahih International
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.
Source
Kur'an-ı Kerim, En'âm Suresi 6:123
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/6-suresi-123-ayet