Surah Al-Jinn 72:4

وَأَنَّهُۥ كَانَ يَقُولُ سَفِيهُنَا عَلَى ٱللَّهِ شَطَطًا

And that our foolish one [i.e., Iblees] has been saying about Allāh an excessive transgression.

Translation: Saheeh International

Tafsir

And that the fool among us the ignorant one among us used to utter atrocious lies against God extreme calumny by attributing to Him a spouse and a son.

Excerpt from Tafsir al-Jalalayn, commentary on 72:4, via Quran.com. The reader has the full commentary and 9 more tafsirs.