Al-An‘âm 6:25
وَمِنْهُم مَّن يَسْتَمِعُ إِلَيْكَ ۖ وَجَعَلْنَا عَلَىٰ قُلُوبِهِمْ أَكِنَّةً أَن يَفْقَهُوهُ وَفِي آذَانِهِمْ وَقْرًا ۚ وَإِن يَرَوْا كُلَّ آيَةٍ لَّا يُؤْمِنُوا بِهَا ۚ حَتَّىٰ إِذَا جَاءُوكَ يُجَادِلُونَكَ يَقُولُ الَّذِينَ كَفَرُوا إِنْ هَٰذَا إِلَّا أَسَاطِيرُ الْأَوَّلِينَ ٢٥
Waminhum man yastamiAAu ilayka wajaAAalna AAala quloobihim akinnatan an yafqahoohu wafee athanihim waqran wain yaraw kulla ayatin la yuminoo biha hatta itha jaooka yujadiloonaka yaqoolu allatheena kafaroo in hatha illa asateeru alawwaleena
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And amongst them are (also) some who keep their ears towards you, and (in view of their evil intentions) We have wrapped their hearts in veils. (So, it is not possible for them now) that they may understand it (the Qur’an) and (We have) plugged their ears. And even if they see all signs (naked), they (still) will not believe in them, so much so that when they approach you and quarrel with you, the disbelievers say (at that time): ‘This (Qur’an) is nothing but fabricated stories of the old folk.’ (6:25)