Job 30:6
In a frightful place of valleys to dwell, Holes of earth and clefts.
Judges 6:2
and the hand of Midian is strong against Israel, from the presence of Midian have the sons of Israel made for themselves the flowings which are in the mountains, and the caves, and the strongholds.
1 Samuel 22:1-2
And David goeth thence, and is escaped unto the cave of Adullam, and his brethren hear, and all the house of his father, and go down unto him thither;
Isaiah 2:19
And men have entered into caverns of rocks, And into caves of dust, Because of the fear of Jehovah, And because of the honour of His excellency, In His rising to terrify the earth.
Revelation 6:15
and the kings of the earth, and the great men, and the rich, and the chiefs of thousands, and the mighty, and every servant, and every freeman, hid themselves in the dens, and in the rocks of the mountains,