Matthew 7:15
Beware of false Teachers--men who come to you in the guise of sheep, but at heart they are ravenous wolves.
Matthew 24:11
Many false Prophets, also, will appear and lead many astray;
Matthew 24:24
For false Christs and false Prophets will arise, and will display great signs and marvels, so that, were it possible, even God's People would be led astray.
Mark 13:22
For false Christs and false Prophets will arise, and display signs and marvels, to lead astray, were it possible, even God's People.
Luke 6:26
Alas for you when all men speak well of you; for this is what their ancestors did to the false Prophets.
2 Thessalonians 2:9
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 Peter 2:1
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.
1 John 4:1
Dear friends, do not trust every inspiration, but test each inspiration, to see whether it proceeds from God; because many false Prophets have gone out into the world.