﴿ فَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا أَوْ كَذَّبَ بِـَٔايَٰتِهِۦٓ ۚ إِنَّهُۥ لَا يُفْلِحُ ٱلْمُجْرِمُونَ ﴾

“And who could be more wicked than they who attribute their own lying inventions to God or give the lie to His messages? Verily, those who are lost in sin will never attain to a happy state -”

The last verse (17) emphasizes the subject conclusively by warning that attributing any statement to Allah Ta` ala that was not His Word, or denying what actually was, were crimes deserving severe punishment.