25 That night the Lord said to Gideon, "Take the second bull from your father's herd, the one that is seven years old. Pull down your father's altar to Baal, and cut down the Asherah pole standing beside it. 26 Then build an altar to the Lord your God here on this hilltop sanctuary, laying the stones carefully. Sacrifice the bull as a burnt offering on the altar, using as fuel the wood of the Asherah pole you cut down." 27 So Gideon took ten of his servants and did as the Lord had commanded. But he did it at night because he was afraid of the other members of his father's household and the people of the town. 28 Early the next morning, as the people of the town began to stir, someone discovered that the altar of Baal had been broken down and that the Asherah pole beside it had been cut down. In their place a new altar had been built, and on it were the remains of the bull that had been sacrificed. 29 The people said to each other, "Who did this?" And after asking around and making a careful search, they learned that it was Gideon, the son of Joash. 30 "Bring out your son," the men of the town demanded of Joash. "He must die for destroying the altar of Baal and for cutting down the Asherah pole."
Matthew Henry's Commentary on Judges 6:25-30
Commentary on Judges 6:25-32
(Read Judges 6:25-32)
See the power of God's grace, that he could raise up a reformer; and the kindness of his grace, that he would raise up a deliverer, out of the family of a leader in idolatry. Gideon must not think it enough not to worship at that altar; he must throw it down, and offer sacrifice on another. It was needful he should make peace with God, before he made war on Midian. Till sin be pardoned through the great Sacrifice, no good is to be expected. God, who has all hearts in his hands, influenced Joash to appear for his son against the advocates for Baal, though he had joined formerly in the worship of Baal. Let us do our duty, and trust God with our safety. Here is a challenge to Baal, to do either good or evil; the result convinced his worshippers of their folly, in praying to one to help them that could not avenge himself.