The dragon stands on the shore of the sea and John sees a beast rising from the sea with ten horns and seven heads, with ten diadems on its horns and blasphemous names on its heads. It looks like a leopard, with feet like a bear's and a mouth like a lion's. The dragon gives it his power, his throne and great authority. One of its heads seems to have a mortal wound, but its mortal wound is healed, and the whole earth marvels and follows the beast (vv. 1-3).
People worship the dragon and the beast, asking who is like the beast and who can fight against it. It is given a mouth uttering great boasts and blasphemies, and authority to act for forty-two months. It blasphemes God, makes war on the saints and conquers them, and receives authority over every tribe, people, language and nation. All who dwell on the earth whose names are not written in the book of life of the Lamb will worship it. A call to hear follows, with the declaration that here is the endurance and faith of the saints (vv. 4-10).
Then John sees another beast rising out of the earth, with two horns like a lamb but speaking like a dragon. It exercises all the authority of the first beast in its presence and makes the earth worship the first beast. It performs great signs, even making fire come down from heaven, and deceives those who dwell on the earth into making an image of the beast. It is allowed to give breath to the image so that it can speak and cause those who do not worship it to be killed (vv. 11-15).
It causes all to receive a mark on the right hand or the forehead, so that no one can buy or sell without it. The chapter closes with a call for wisdom: let the one who has understanding calculate the number of the beast, which is the number of a man, and it is 666 (vv. 16-18).