Seven: Miscellany of Sevens: Seven Heads and Seven Crowns
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Revelation 12:3
Then another sign appeared in heaven: a huge red dragon with seven heads, ten horns, and seven royal crowns on his heads.
Revelation 13:1
Then I saw a beast with ten horns and seven heads rising out of the sea. There were ten royal crowns on its horns and blasphemous names on its heads.
Revelation 17:9
This calls for a mind with wisdom. The seven heads are seven mountains on which the woman sits.