Genesis 14:2

² That these made war with Bera king of Sodom, and with Birsha king of Gomorrah, Shinab king of Admah, and Shemeber king of Zeboiim, and the king of Bela, which is Zoar.

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'To hide themselves in the dens and in the rocks of the mountains,' as mentioned in Revelation 6:15, signifies being in evils and falsities of evil.