Surah Al-An'am 6:21

وَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا أَوْ كَذَّبَ بِـَٔايَـٰتِهِۦٓ ۗ إِنَّهُۥ لَا يُفْلِحُ ٱلظَّـٰلِمُونَ

And who is more unjust than one who invents about Allāh a lie or denies His verses? Indeed, the wrongdoers will not succeed.

Translation: Saheeh International

Tafsir

And who that is none does greater evil than he who invents a lie against God by ascribing to Him an associate or denies His signs? the Qur’ān; it is verily the case that they the evildoers shall not prosper on account of this.

Excerpt from Tafsir al-Jalalayn, commentary on 6:21, via Quran.com. The reader has the full commentary and 9 more tafsirs.