Hebrews 11:38
(The world did not deserve such people). They wandered in deserts and mountains, [living] in caves and [even] holes in the ground.
Revelation 6:15
And the kings of the earth, the princes, the military commanders, the rich people, the influential people and every slave and free man hid themselves in the caves and among mountain ledges.
Treasury of Scripture Knowledge
Summary
And the hand of Midian prevailed against Israel: and because of the Midianites the children of Israel made them the dens which are in the mountains, and caves, and strong holds.
Bible References
Dens
Hebrews 11:38
(The world did not deserve such people). They wandered in deserts and mountains, [living] in caves and [even] holes in the ground.
Revelation 6:15
And the kings of the earth, the princes, the military commanders, the rich people, the influential people and every slave and free man hid themselves in the caves and among mountain ledges.