9 Here is the mind having wisdom: The seven heads are seven mountains, where the woman sits on them;
Revelation 17:9 Cross References - BLB
Matthew 13:11
11 And answering He said to them, “Because it has been granted to you to know the mysteries of the kingdom of the heavens, but to them it has not been granted.
Matthew 24:15
15 Therefore when you shall see ‘the abomination of desolation,’ having been spoken of by the prophet Daniel, standing in the holy place—the one reading, let him understand—
Revelation 13:1
1 And I saw rising out of the sea a beast, having ten horns, and seven heads, and on its horns, ten diadems, and upon its heads, names of blasphemy.
Revelation 13:18
18 Here is the wisdom. The one having understanding, let him count the number of the beast, for it is a man’s number, and its number is six hundred sixty-six.
Revelation 17:3
3 And he carried me away in the Spirit into a wilderness, and I saw a woman sitting upon a scarlet beast being full of names of blasphemy, having seven heads and ten horns.
Revelation 17:7
7 And the angel said to me, “Why did you marvel? I will tell you the mystery of the woman, and of the beast carrying her, having the seven heads and the ten horns.
Revelation 17:18
18 And the woman whom you saw is the great city, having kingship over the kings of the earth.”