وَجَعَلْنَا عَلَى قُلُوبِهِمْ أَكِنَّةً أَن يَفْقَهُوهُ وَفِي آذَانِهِمْ وَقْرًا وَإِذَا ذَكَرْتَ رَبَّكَ فِي الْقُرْآنِ وَحْدَهُ وَلَّوْاْ عَلَى أَدْبَارِهِمْ نُفُورًا
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سورة الإسراء
(17/46) And We set up over their hearts veils lest they understand it, and in their ears heaviness and when thou mentionest in reciting the Qur´an thy Lord alone, they turn backward as averters.
Surah Al-Isra