'Caves' in the Bible

They wandered across deserts and mountains, or hid themselves in caves and in holes in the ground.

For God did not spare angels when they had sinned, but hurling them down to Tartarus consigned them to caves of darkness, keeping them in readiness for judgement.

The kings of the earth and the great men, the military chiefs, the wealthy and the powerful--all, whether slaves or free men--hid themselves in the caves and in the rocks of the mountains,