Ar-Rûm 30:59
كَذَٰلِكَ يَطْبَعُ اللَّهُ عَلَىٰ قُلُوبِ الَّذِينَ لَا يَعْلَمُونَ ٥٩
Kathalika yatbaAAu Allahu AAala quloobi allatheena la yaAAlamoona
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That is how Allah seals the hearts of the people who do not know (the truth, despite it becomes evident). (30:59)