Matthew 7:15
"Beware of false prophets, who come to you in sheep's clothing, but inwardly they are ravenous wolves.
2 Corinthians 11:13
For such men are false apostles, deceitful workmen, disguising themselves as apostles of Christ.
2 Peter 2:1-3
But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.
1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are of God; because many false prophets have gone out into the world.
Revelation 19:20
And the beast was captured, and with him the false prophet who had performed the signs in his presence, by which he deceived those who had received the mark of the beast and those who worshipped his image. These two were thrown alive into the lake of fire which burns with sulfur.