2 Corinthians 11:13-15
For such men are sham apostles, dishonest workmen, masquerading as apostles of Christ.
Galatians 2:4
they did not try it even for the sake of the false brothers who had been smuggled in, who stole in to spy out the freedom we enjoy in Christ Jesus, so as to make us slaves again.
2 Timothy 3:8
Just as Jannes and Jambres resisted Moses, these people resist the truth, for they are depraved in mind and so counterfeits in the faith.
2 Peter 2:1-2
Now there were false prophets among the people, just as there will be false teachers among you too, who will insidiously introduce destructive heresies and deny the Master who has bought them, thus bringing on themselves swift destruction.