to me, verses like this are enough:
Tafsir al-Jalalayn
{ وَإِنَّ مِنْهُمْ لَفَرِيقاً يَلْوُونَ أَلْسِنَتَهُمْ بِٱلْكِتَابِ لِتَحْسَبُوهُ مِنَ ٱلْكِتَابِ وَمَا هُوَ مِنَ الْكِتَابِ وَيَقُولُونَ هُوَ مِنْ عِنْدِ اللًّهِ وَمَا هُوَ مِنْ عِندِ ٱللَّهِ وَيَقُولُونَ عَلَى ٱللَّهِ ٱلْكَذِبَ وَهُمْ يَعْلَمُونَ }
And there is a group, a party, of them, the People of the Scripture, like Ka‘b b. al-Ashraf, who twist their tongues with the Book, altering it by reciting it not according to the way in which it was revealed, but according to the way in which they have distorted it, as in the case of the descriptions of the Prophet (s) and other similar matters; so that you may suppose it, such distortion, as part of the Book, that God revealed; yet it is not part of the Book; and they say, ‘It is from God’, yet it is not from God, and they speak falsehood against God, while they know, that they are liars.