Revelation 12:3-4
And there appeared another symbol in heaven, and behold, a great fiery dragon, having seven heads and ten horns and upon his heads seven diadems,
Revelation 12:16-17
And the earth helped the woman, and the earth opened her mouth and swallowed up the river which the dragon cast out of his mouth.
Revelation 13:2
And the beast which I saw was like a leopard, and his feet like those of a bear, and his mouth like the mouth of a lion. And the dragon gave him his power and his throne and great authority.
Revelation 13:4
and they worshipped the dragon, because he gave power to the beast, and worshipped the beast, saying, Who is like the beast, and who is able to make war with him?
Revelation 13:11
And I saw another beast come up out of the earth, and he had two horns like a lamb and spoke like a dragon.
Revelation 16:13
And I saw three impure spirits like frogs [proceed] from the mouth of the dragon and from the mouth of the beast and from the mouth of the false prophet;??14 for [these] are spirits of demons that perform miracles, that go to the kings of all the world, to assemble them for the battle of that great day of God Almighty.
Revelation 20:2
And he took the dragon, which is the old serpent, who is the devil and Satan, and bound him a thousand years,