'Clefts of the Rock' in the Bible

Behold, I will send for many fishers, saith Jehovah, and they shall fish them up; and afterward I will send for many hunters, and they shall hunt them from every mountain, and from every hill, and out of the clefts of the rocks.

As for thy terribleness, the pride of thy heart hath deceived thee, O thou that dwellest in the clefts of the rock, that holdest the height of the hill: though thou shouldest make thy nest as high as the eagle, I will bring thee down from thence, saith Jehovah.