2 Corinthians 11:13-15
For such fellows are sham apostles of Christ.
Matthew 7:15
"Beware of the false prophets who come to you in sheep's clothing, but within they are ravening wolves.
Philippians 3:2
Beware of "these dogs," these mischievous workers, beware of the concision!
2 Peter 2:1-3
But there were false prophets, too, among the people, just as among you also there will be false teachers. These will secretly bring in destructive sects, denying even the Master who bought them, and bringing swift ruin upon themselves.
1 John 4:1
Do not believe every spirit, beloved, but test the spirits to see whether they are of God; for many false prophets are gone out into the world.