'Clefts of the Rock' in the Bible

To go into the clefts of the rocks, and into the fissures of the rocks from the face of the fear of Jehovah, and from the splendor of his majesty in his rising to terrify the earth.

And they shall come and rest all of them in the valleys, and in the clefts of the rocks, and in all the thorn hedges, and in all pastures.

Being comforted with gods under every green tree, slaughtering the children in the valleys, under the clefts of the rocks?

Behold me sending for many fishers, says Jehovah, and they fished them; and after this I will send for many hunters, and they hunted them from every mountain, and from every hill, and from the clefts of the rocks.