Caves were Used as Places of Concealment

Seeing that they were in danger because their troops were hard-pressed, the men of Israel hid in caves and thickets, among the rocks, and in cellars and cisterns.

So the two of them showed themselves to the outpost of the Philistines, who exclaimed, “Look, the Hebrews are coming out of the holes in which they were hiding!”

…for when Jezebel had slaughtered the prophets of the LORD, Obadiah had taken a hundred prophets and hidden them, fifty men per cave, providing them with food and water.)

The world was not worthy of them. They wandered in deserts and mountains, and hid in caves and holes in the ground.