وَإِذا ما أُنزِلَت سورَةٌ نَظَرَ بَعضُهُم إِلىٰ بَعضٍ هَل يَراكُم مِن أَحَدٍ ثُمَّ انصَرَفوا ۚ صَرَفَ اللَّهُ قُلوبَهُم بِأَنَّهُم قَومٌ لا يَفقَهونَ

And whenever a surah is revealed, they look at each other, [saying], "Does anyone see you?" and then they dismiss themselves. Allah has dismissed their hearts because they are a people who do not understand.