Surah At-Tur 52:33

أَمْ يَقُولُونَ تَقَوَّلَهُۥ ۚ بَل لَّا يُؤْمِنُونَ

Or do they say, "He has made it up"? Rather, they do not believe.

Translation: Saheeh International

Tafsir

Or do they say ‘He has improvised it?’ he has concocted the Qur’ān. He has not concocted it; Rather they do not believe out of arrogance. If they continue to say that he has concocted it

Excerpt from Tafsir al-Jalalayn, commentary on 52:33, via Quran.com. The reader has the full commentary and 9 more tafsirs.