Quran 6:25 from Surah Al-An'aam on Divine Marvels.
وَمِنۡهُم مَّن يَسۡتَمِعُ إِلَيۡكَۖ وَجَعَلۡنَا عَلَىٰ قُلُوبِهِمۡ أَكِنَّةً أَن يَفۡقَهُوهُ وَفِيٓ ءَاذَانِهِمۡ وَقۡرٗاۚ وَإِن يَرَوۡاْ كُلَّ ءَايَةٖ لَّا يُؤۡمِنُواْ بِهَاۖ حَتَّىٰٓ إِذَا جَآءُوكَ يُجَٰدِلُونَكَ يَقُولُ ٱلَّذِينَ كَفَرُوٓاْ إِنۡ هَٰذَآ إِلَّآ أَسَٰطِيرُ ٱلۡأَوَّلِينَ
English translation: And among them (are those) who listen to you but We have placed over their hearts coverings lest they understand it and in their ears deafness And if they see every sign not will they believe in it Until when they come to you and argue with you say those who disbelieved Not (is) this but (the) tales (of) the former (people)
Transliteration: wamin'hum man yastami'u ilayka waja'alna ala qulubihim akinnatan an yafqahuhu wafi adhanihim waqran wa-in yaraw kulla ayatin la yu'minu biha hatta idha jauka yujadilunaka yaqulu alladhina kafaru in hadha illa asatiru al-awalina