Matthew 7:15
"Beware of false prophets, who, indeed, come to you in sheep's clothing, but within are ravening wolves.
2 Corinthians 11:13
For such men are false apostles, deceitful workers, transforming themselves into apostles of Christ;
2 Peter 2:1-3
But there arose false prophets also among the people, as among you also there will be false teachers, who, indeed, will stealthily bring in destructive heresies, denying even the Master Who bought them, bringing 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 have gone forth into the world.
Revelation 19:20
And the beast was seized, and with him the false prophet that wrought the signs in his presence, with which he deceived those who received the mark of the beast, and who worshiped his image. The two were cast alive into the lake of fire that burns with brimstone.