Surah Al-Qalam 68:15

إِذَا تُتْلَىٰ عَلَيْهِ ءَايَـٰتُنَا قَالَ أَسَـٰطِيرُ ٱلْأَوَّلِينَ

When Our verses are recited to him, he says, "Legends of the former peoples."

Translation: Saheeh International

Tafsir

When Our signs — the Qur’ān — are recited to him he says that they are merely ‘Fables of the ancients!’ in other words he denies them in arrogance on account of the mentioned things which We have bestowed on him out of Our grace a variant reading for an of the previous verse has the interrogative a-an.

Excerpt from Tafsir al-Jalalayn, commentary on 68:15, via Quran.com. The reader has the full commentary and 9 more tafsirs.