2 Corinthians 11:13-15
For such are false apostles, deceitful workers, transformed into apostles of Christ.
Matthew 7:15
And beware of false prophets, who come to you in sheeps clothing, but inwardly they are ravenous wolves.
Philippians 3:2
Beware of those that are like dogs, beware of evil doers, beware of the concision.
2 Peter 2:1-3
But there were indeed false prophets among the people of old, as there will be also among you false teachers, who will privately introduce pernicious heresies, denying even the Lord that bought them, and bringing upon themselves swift destruction,
1 John 4:1
Beloved, believe not every Spirit, but try the spirits, whether they be of God: for many false prophets are gone out into the world.