Surah Al-An'am (The Cattle), Verse 25

وَمِنْهُمْ مَّنْ یَّسْتَمِعُ اِلَیْكَ وَجَعَلْنَا عَلٰی قُلُوْبِهِمْ اَكِنَّةً اَنْ یَّفْقَهُوْهُ وَفِیْۤ اٰذَانِهِمْ وَقْرًا وَاِنْ یَّرَوْا كُلَّ اٰیَةٍ لَّا یُؤْمِنُوْا بِهَا حَتّٰۤی اِذَا جَآءُوْكَ یُجَادِلُوْنَكَ یَقُوْلُ الَّذِیْنَ كَفَرُوْۤا اِنْ هٰذَاۤ اِلَّاۤ اَسَاطِیْرُ الْاَوَّلِیْنَ ۟

Wa minhum mai yastami'u ilaika wa ja'alnaa 'alaa quloobihim akinnatan ai yafqahoohu wa feee aazaanihim waqraa; wa ai yaraw kulla Aayatil laa yu'minoo bihaa; hattaaa izaa jaaa'ooka yujaadiloonaka yaqoolul lazeena kafaroo in haazaa illaaa asaateerul awwaleen

“Of them there are some who (pretend to) listen to thee; but We have thrown veils on their hearts, So they understand it not, and deafness in their ears; if they saw every one of the signs, not they will believe in them; in so much that when they come to thee, they (but) dispute with thee; the Unbelievers say: "These are nothing but tales of the ancients."”

Quran 6:25 (Yusuf Ali Translation)