2 Corinthians 11:13-15
For such are false apostles, deceitful workers, transforming themselves into apostles of Christ.
Matthew 7:15
But beware of false prophets, who come to you in sheeps clothing, but inwardly they are ravenous wolves.
Philippians 3:2
Beware of dogs, beware of evil-workers,
2 Peter 2:1-3
But there were false prophets also among the people, as there shall likewise be false teachers among you, who will privily bring in destructive heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
1 John 4:1
Beloved, believe not every spirit, but try the spirits, whether they are of God, because many false prophets are gone out into the world.