25 That night the Lord said to him, "Take your father's bull, the second bull seven years old, and pull down the altar of Baal that belongs to your father, and cut down the sacred pole that is beside it; 26 and build an altar to the Lord your God on the top of the stronghold here, in proper order; then take the second bull, and offer it as a burnt offering with the wood of the sacred pole that you shall cut down." 27 So Gideon took ten of his servants, and did as the Lord had told him; but because he was too afraid of his family and the townspeople to do it by day, he did it by night. 28 When the townspeople rose early in the morning, the altar of Baal was broken down, and the sacred pole beside it was cut down, and the second bull was offered on the altar that had been built. 29 So they said to one another, "Who has done this?" After searching and inquiring, they were told, "Gideon son of Joash did it." 30 Then the townspeople said to Joash, "Bring out your son, so that he may die, for he has pulled down the altar of Baal and cut down the sacred pole beside it."
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.