Jeremiah 36:31

³¹ And I will visit their iniquity upon him, and upon his seed, and upon his servants; and I will bring upon them, and upon the inhabitants of Jerusalem, and upon the men of Judah, all the evil that I have pronounced against them; and they have not hearkened.

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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.