1 Peter 5:8
Be sober, be vigilant: your adversary, the devil, is walking about as a roaring lion, seeking whom he may devour:
2 Peter 2:1
But there were also false prophets among the people, even as there will be false teachers among you; who will privately introduce destructive sects, denying even the Lord who bought them, bringing on themselves swift destruction.
Revelation 2:20
Nevertheless, I have against you, that you permit that woman Jezebel, who says that she is a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed to idols.
Revelation 12:9
And thus the great dragon was cast out; even the old serpent called the Devil, and Satan, who deceives the world, was cast out to the earth; and his angels were cast out with him.
Revelation 13:14
and it deceives the inhabitants of the earth by signs which it is given it to do before the beast; commanding the inhabitants of the earth to make an image of the beast that had the wound of the sword, and lived.