2 Corinthians 11:13-15
Men of this stamp are false apostles, treacherous workers, disguising themselves as Apostles of Christ!
Galatians 2:4
But, on account of the false Brothers who had stolen in, the men who had crept in to spy upon the liberty which we have through union with Christ Jesus, in order to bring us back to slavery--
2 Timothy 3:8
Just as Jannes and Jambres opposed Moses, so do these people, in their turn, oppose the Truth. Their minds are corrupted, and, as regards the Faith, they are utterly worthless.
2 Peter 2:1-2
But there were false prophets also in the nation, just as there will be false teachers among you, men who will secretly introduce ruinous divisions, disowning even the Lord who bought them, and bringing speedy Ruin upon themselves.