'Cleft of the Rock' in the Bible

He struck them hip and thigh with a great slaughter: and he went down and lived in the cleft of the rock of Etam.

Then three thousand men of Judah went down to the cleft of the rock of Etam, and said to Samson, "Do you not know that the Philistines are rulers over us? What then is this that you have done to us?" He said to them, "As they did to me, so have I done to them."