6:123
وَكَذَٰلِكَ جَعَلْنَا فِى كُلِّ قَرْيَةٍ أَكَـٰبِرَ مُجْرِمِيهَا لِيَمْكُرُوا۟ فِيهَا ۖ وَمَا يَمْكُرُونَ إِلَّا بِأَنفُسِهِمْ وَمَا يَشْعُرُونَ
wakadhālika jaʿalnā fī kulli qaryatin akābira muj'rimīhā liyamkurū fīhā wamā yamkurūna illā bi-anfusihim wamā yashʿurūna
And so We have put chief evildoers in every city to perpetrate their schemes there- but they scheme only against themselves, without realizing it.
And thus We have set up in every town great ones of its wicked people to plot therein. But they plot not except against their ownselves, and they perceive (it) not.