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

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."

— Al-An'am (ٱلْأَنْعَام), 6:25