Then the angel said to me: "Why are you astonished? I will explain to you the mystery1 of the woman and of the beast she rides, which has the seven heads and ten horns.2
References for Revelation 17:7
The beast, which you saw, once was, now is not, and will come up out of the Abyss3 and go to his destruction.4 The inhabitants of the earth5 whose names have not been written in the book of life6 from the creation of the world will be astonished7 when they see the beast, because he once was, now is not, and yet will come.
References for Revelation 17:8
"This calls for a mind with wisdom.8 The seven heads9 are seven hills on which the woman sits.
References for Revelation 17:9
They are also seven kings. Five have fallen, one is, the other has not yet come; but when he does come, he must remain for a little while.
The beast who once was, and now is not,10 is an eighth king. He belongs to the seven and is going to his destruction.
References for Revelation 17:11
"The ten horns11 you saw are ten kings who have not yet received a kingdom, but who for one hour12 will receive authority as kings along with the beast.
References for Revelation 17:12