Surah Al-Furqan 25:5

وَقَالُوٓا۟ أَسَـٰطِيرُ ٱلْأَوَّلِينَ ٱكْتَتَبَهَا فَهِىَ تُمْلَىٰ عَلَيْهِ بُكْرَةً وَأَصِيلًا

And they say, "Legends of the former peoples which he has written down, and they are dictated to him morning and afternoon."

Translation: Saheeh International

Tafsir

And they say that it the Qur’ān is also ‘Fables their lies asātir is the plural of ustūra of the ancients which he has had written down that he has had someone from among those people copy it down for him so that they are read to him for him to memorise morning and evening’. God exalted be He responds to them saying

Excerpt from Tafsir al-Jalalayn, commentary on 25:5, via Quran.com. The reader has the full commentary and 9 more tafsirs.