And the children of Israel did evil in the sight of the LORD: and the LORD delivered them into the hand of Midian seven years.

Wesley's Notes

6:1 Of Midian - For although the generality of the Midianites had been cut off by Moses about two hundred years ago, yet many of them doubtless fled into the neighbouring countries, whence afterwards they returned into their own land, and in that time might easily grow to be a very great number; especially, when God furthered their increase, that they might be a scourge for Israel when they transgressed. Let all that sin, expect to suffer: let all that turn to folly, expect to return to misery.

Jamieson-Fausset-Brown Bible Commentary

CHAPTER 6

Jud 6:1-6. The Israelites, for Their Sins, Oppressed by Midian.

1. and the Lord delivered them into the hand of Midian-Untaught by their former experiences, the Israelites again apostatized, and new sins were followed by fresh judgments. Midian had sustained a severe blow in the time of Moses (Nu 31:1-18); and the memory of that disaster, no doubt, inflamed their resentment against the Israelites. They were wandering herdsmen, called "children of the East," from their occupying the territory east of the Red Sea, contiguous to Moab. The destructive ravages they are described as at this time committing in the land of Israel are similar to those of the Bedouin Arabs, who harass the peaceful cultivators of the soil. Unless composition is made with them, they return annually at a certain season, when they carry off the grain, seize the cattle and other property; and even life itself is in jeopardy from the attacks of those prowling marauders. The vast horde of Midianites that overran Canaan made them the greatest scourge which had ever afflicted the Israelites.

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.