وَإِذَا مَا أُنزِلَتْ سُورَةٌ نَّظَرَ بَعْضُهُمْ إِلَى بَعْضٍ هَلْ يَرَاكُم مِّنْ أَحَدٍ ثُمَّ انصَرَفُواْ صَرَفَ اللّهُ قُلُوبَهُم بِأَنَّهُمْ قَوْمٌ لاَّ يَفْقَهُون
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سورة التوبة
(9/127) Whenever a Sûrah (a chapter) is sent down, they cast glances at one another and ask: “Has anyone seen you”? Then they turn away. Allah has turned away their hearts because they are a people who do not understand.
Surah At-Tawbah