American Standard Version
to go into the caverns of the rocks, and into the clefts of the ragged rocks, from before the terror of Jehovah, and from the glory of his majesty, when he ariseth to shake mightily the earth.

Berean Study Bible
They will flee to caverns in the rocks and crevices in the cliffs, away from the terror of the LORD and from the splendor of His majesty, when He rises to shake the earth.

Douay-Rheims Bible
And he shall go into the clefts of rocks, and into the holes of stones from the face of the fear of the Lord, and from the glory of his majesty, when he shall rise up to strike the earth.

English Revised Version
to go into the caverns of the rocks, and into the clefts of the ragged rocks, from before the terror of the LORD, and from the glory of his majesty, when he ariseth to shake mightily the earth.

King James Bible
To go into the clefts of the rocks, and into the tops of the ragged rocks, for fear of the LORD, and for the glory of his majesty, when he ariseth to shake terribly the earth.

World English Bible
To go into the caverns of the rocks, and into the clefts of the ragged rocks, from before the terror of Yahweh, and from the glory of his majesty, when he arises to shake the earth mightily.

Young's Literal Translation
To enter into cavities of the rocks, And into clefts of the high places, Because of the fear of Jehovah, And because of the honour of His excellency, In His rising to terrify the earth.

Isaiah 2:21 Additional Translations ...