Revelation 13:1 (WEB)
Then I stood on the sand of the sea. I saw a beast coming out of the sea, having ten horns and seven heads. On his horns were ten crowns, and on his heads, blasphemous names.
Revelation 13:2 (WEB)
The beast which I saw was like a leopard, and his feet were like those of a bear, and his mouth like the mouth of a lion. The dragon gave him his power, his throne, and great authority.
Revelation 13:3, One of his heads looked like it had been wounded fatally. His fatal wound was healed, and the whole earth marveled at the beast. - WEB
Revelation 13:4 (WEB) - 4 They worshiped the dragon, because he gave his authority to the beast, and they worshiped the beast, saying, “Who is like the beast? Who is able to make war with him?”
Revelation 13:8 (WEB) - 8 All who dwell on the earth will worship him, everyone whose name has not been written from the foundation of the world in the book of life of the Lamb who has been killed.
Revelation 13:10 (WEB) - 10 If anyone is to go into captivity, he will go into captivity. If anyone is to be killed with the sword, he must be killed. Here is the endurance and the faith of the saints.
Revelation 13:12, 12 He exercises all the authority of the first beast in his presence. He makes the earth and those who dwell in it to worship the first beast, whose fatal wound was healed. - WEB
Revelation 13:14, 14 He deceives my own people who dwell on the earth because of the signs he was granted to do in front of the beast, saying to those who dwell on the earth that they should make an image to the beast who had the sword wound and lived. - WEB
Revelation 13:15, 15 It was given to him to give breath to the image of the beast, that the image of the beast should both speak, and cause as many as wouldn’t worship the image of the beast to be killed. - WEB
Revelation 13:16 (KJV)
He causes all, the small and the great, the rich and the poor, the free and the slave, to be given marks on their right hands or on thereforeheads;
Revelation 13:17 (KJV)
and that no-one would be able to buy or to sell unless he has that mark, which is the name of the beast or the number of his name.
Revelation 13:18 (KJV)
Now here is wisdom. Let he who has understanding, let him calculate the number of the beast, for it is the number of a man. The number is six hundred sixty-six.