As in Daniel the Beast Government/Kingdom has a king, and they are spoken of as "one entity", but the actual Beast is called a "horn":
17 `Those great beasts, which are four, are four kings which arise out of the earth.
18 `But the saints of the Most High shall receive the kingdom, and possess the kingdom forever, even forever and ever.'
19 "Then I wished to know the truth about the fourth beast, which was different from all the others, exceedingly dreadful, with its teeth of iron and its nails of bronze, which devoured, broke in pieces, and trampled the residue with its feet;
20 "and the ten horns that were on its head, and the other horn which came up, before which three fell, namely, that horn which had eyes and a mouth which spoke pompous words, whose appearance was greater than his fellows.
21 "I was watching; and the same horn was making war against the saints, and prevailing against them, (Dan. 7:17-21 NKJ)
The Seven heads on the Beast in Revelation represent Seven World Empires, the ten horns are the ten kings who reign in the end time, and only one of them becomes the "mouth" of the Beast. At first the Beast "Man of Sin" appears as a False Christ, the mouth of a lion. But at "midweek" or 3.5 years, he morphs into the "Antichrist Son of Perdition", and reigns an additional 42 months during which he persecutes Christians:
NKJ Revelation 13:1 Then I stood on the sand of the sea. And I saw a beast rising up out of the sea, having seven heads and ten horns, and on his horns ten crowns, and on his heads a blasphemous name.
2 Now the beast which I saw was like a leopard, his feet were like the feet of a bear, and his mouth like the mouth of a lion. The dragon gave him his power, his throne, and great authority.
3 And I saw one of his heads as if it had been mortally wounded, and his deadly wound was healed. And all the world marveled and followed the beast.
4 So they worshiped the dragon who gave authority to the beast; and they worshiped the beast, saying, "Who is like the beast? Who is able to make war with him?"
5 And he was given a mouth speaking great things and blasphemies, and he was given authority to continue for forty-two months. (Rev. 13:1-5 NKJ)
The monster having seven heads and ten horns (Rev. 13:1-5) is the last global government to rise in the seven-year end time "week" before the coming Kingdom of God. In the book of Daniel this is the fourth and last government beast to rise (Dan. 7:7). Because it is a Grecian version of the old
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