Matthew 7:15-17
Beware of false Teachers--men who come to you in the guise of sheep, but at heart they are ravenous wolves.
John 3:19-21
The ground of his condemnation is this, that though the Light has come into the world, men preferred the darkness to the Light, because their actions were wicked.
2 Corinthians 11:13-15
Men of this stamp are false apostles, treacherous workers, disguising themselves as Apostles of Christ!
2 Thessalonians 2:9-11
For at the Coming of the Lord there will be great activity on the part of Satan, in the form of all kinds of deceptive miracles, signs, and marvels, as well as of wicked attempts to delude--
2 Timothy 4:3-4
For a time will come when people will not tolerate sound teaching. They will follow their own wishes, and, in their itching for novelty, procure themselves a crowd of teachers.
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.