Isaiah 2:21 - Ellicott's Commentary On The Whole Bible

To go into the clefts of the rocks... — Comp. for the phrase, Exodus 33:22. The picture of Isaiah 2:19 is reproduced, with some noticeable variations. As men feel shock after shock of the earthquake, and see the flashing fires, and hear the crash of the thunder, they leave the larger caverns in which they had at first sought shelter, and where they have left the idols that were once so precious, and fly to the smaller and higher openings, the “clefts of the rocks,” and the rents of the crags, in their unspeakable panic.