'Cleft of the Rock' in the Bible

And he will strike them leg upon thigh, a great smiting. And he will go down and dwell in the cleft of the rock Etam.

And three thousand men of Judah will go down to the cleft of the rock Etam, and they will say to Samson, Knewest thou not that Philisteim is ruling over us? and what this thou didst to us? and he will say to them, As they did to me, so did I to them.

Take the girdle that thou boughtest, which is upon thy loins, and arising, go to Euphrates and hide it there in the cleft of the rock.