الإِسۡرَاءِ · 46

وَجَعَلۡنَا عَلَىٰ قُلُوبِهِمۡ أَكِنَّةً أَن يَفۡقَهُوهُ وَفِيٓ ءَاذَانِهِمۡ وَقۡرࣰ اۚ وَإِذَا ذَكَرۡتَ رَبَّكَ فِي ٱلۡقُرۡءَانِ وَحۡدَهُۥ وَلَّوۡاْ عَلَىٰٓ أَدۡبَٰرِهِمۡ نُفُورࣰ ا

And We put coverings over their hearts (and minds) lest they should understand the Qur'an, and deafness into their ears: when thou dost commemorate thy Lord and Him alone in the Qur'an, they turn on their backs, fleeing (from the Truth)