(Asshuara’) 26 : 200
كَذَٰلِكَ سَلَكْنَاهُ فِي قُلُوبِ الْمُجْرِمِينَ
Just like that We have inserted it like a hot iron rod into the hearts of Mujirims.
Not the Arabic Quran, but Adhikr is like a hot iron rod that penetrates the hearts of Fujjar who hide and reject It. See explanation 7: 40 and 15: 12-13.