“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.”
King James Version (KJV)
Matthew Henry's Concise Commentary
6:1-6 Israel's sin was renewed, and Israel's troubles were repeated. Let all that sin expect to suffer. The Israelites hid themselves in dens and caves; such was the effect of a guilty conscience. Sin dispirits men. The invaders left no food for Israel, except what was taken into the caves. They prepared that for Baal with which God should have been served, now God justly sends an enemy to take it away in the season thereof.
“And he that burneth her shall wash his clothes in water, and bathe his flesh in water, and shall be unclean until the even.”