Ophrah was where there was once a Baal altar, which Gideon destroyed (Judges 6:25–27) and replaced it by restoring worship of the Lord. Now Satan is striking back. The worship of Baal is restored by the sacrifice of seventy sons of Gideon at the exact spot where theh earlier Baal altar had stood. Abimelech is not a follower of Yahweh, but of Baal. “This story is therefore ‘the clashing of the two deities, mano e mano, in the form of their respective human agents.’ It appears that Baal had contended…and Baal had won!”1
5 And he went to his father’s house at Ophrah and killed his brothers the sons of Jerubbaal, seventy men, on one stone. But Jotham the youngest son of Jerubbaal was left, for he hid himself.