Dens used As Places of Refuge
Source: Nav
Judges 6:2
and the hand of Midian prevailed against Israel. Because of the Midianites, the Israelites prepared shelters for themselves in the mountains, caves, and strongholds.
Hebrews 11:38
The world was not worthy of them. They wandered in deserts and mountains, and hid in caves and holes in the ground.
Revelation 6:15
Then the kings of the earth, the nobles, the commanders, the rich, the mighty, and every slave and free man hid in the caves and among the rocks of the mountains.