﴿ وَإِذَا تُتْلَىٰ عَلَيْهِمْ ءَايَٰتُنَا قَالُوا۟ قَدْ سَمِعْنَا لَوْ نَشَآءُ لَقُلْنَا مِثْلَ هَٰذَآ ۙ إِنْ هَٰذَآ إِلَّآ أَسَٰطِيرُ ٱلْأَوَّلِينَ ﴾

“And whenever Our messages were conveyed to them, they would say, "We have heard [all this] before; if we wanted, we could certainly compose sayings like these [ourselves]: they are nothing but fables of ancient times!"”

And when Our verses namely the Qur’ān were being recited to them they said ‘We have already heard! If we wish we can speak the like of this — al-Nadr b. al-Hārith said this for he used to travel on trading business to al-Hīra where he would buy books containing the tales of the Persians and would recount these to the Meccans; this Qur’ān is nothing but the fables the lies of the ancients’.