Matthew 7:15
"Look out for false prophets, who come to you under the guise of sheep, but inside they are devouring wolves.
Matthew 16:6
And Jesus said to them, "Look out, and keep on guarding yourselves against the yeast of the Pharisees and the Sadducees!"
Matthew 16:12
Then they understood that He meant, guard yourselves not against yeast for bread, but against the teaching of the Pharisees and the Sadducees.
Mark 4:24
And He was saying to them: "Take care what you hear. The measure you give will come back to you, and more besides.
Mark 7:6-14
But He answered them, "Isaiah beautifully prophesied about you hypocrites; as the Scripture says: "'This people honor me with their lips, but their hearts are far, far away from me;
John 10:5
But they will never come on behind a stranger, but will run away from him, because they do not know the voice of strangers."
2 Corinthians 11:13-15
For such men are sham apostles, dishonest workmen, masquerading as apostles of Christ.
Ephesians 4:14
so that we may not be babies any longer, or like sailors tossed about and driven around by every wind of doctrine, by the trickery of men through their cunning in inventing new methods of error.
1 Timothy 4:7
But make it your habit to let worldly and old women's stories alone. Continue training yourself for the religious life.
1 Timothy 6:3-5
If anyone teaches different doctrines and refuses to agree with the wholesome messages of our Lord Jesus Christ, the teaching that is in accordance with true religion,
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.
1 John 4:1
Dearly beloved, stop believing every so-called spiritual utterance, but keep testing them to see whether they come from God, because many false prophets have gone out into the world.
2 John 1:10
If anyone continuously comes to see you without bringing this teaching, you must stop welcoming him to your house and stop bidding him good morning,
Revelation 2:2
"I know what you have done; your hard work and patient endurance; that you cannot tolerate wicked persons; that you have tested those who claimed to be apostles although they were not, and have found them to be imposters,