Matthew 7:15
Beware of false prophets, who to outward appearance are sheep, but inwardly they are ravenous wolves.
2 Timothy 4:3
for the time will come, when they will not endure sound doctrine, but get teachers of their own corrupt taste, to sooth their ears that itch for flattery:
2 Peter 2:1-3
As there were false prophets among the people of Israel, there will likewise be false doctors among you, who by introducing pernicious sects, and by renouncing the Lord, who bought them, will bring upon themselves swift destruction.
Revelation 19:20
and the beast was taken, and with him the false prophet that wrought miracles in his favour, by which he seduc'd those that had received the mark of the beast, and those that worshipped his image. these were both cast alive into a lake of fire burning with brimstone.