Revelation 6:15-16

and the kings of the earth, and the grandees, and the rich men, and the chief officers, and the powerful men, and every slave, and every freeman, hid themselves in the caves, and rocks of the mountains:

Revelation 15:3-4

And they sang the song of Moses, the servant of God, and the song of the Lamb; saying, Great and wonderful are thy works, O Lord God Almighty; righteous and true are thy ways, O King of Saints.

Treasury of Scripture Knowledge

Summary

Enter into the rock, and hide thee in the dust, for fear of the LORD, and for the glory of his majesty.

Bible References

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Revelation 6:15
and the kings of the earth, and the grandees, and the rich men, and the chief officers, and the powerful men, and every slave, and every freeman, hid themselves in the caves, and rocks of the mountains: