Judges 3:7 - Matthew Poole's English Annotations on the Holy Bible

i.e. In the groves, in which the heathens usually worshipped their Baalims or idols. Or, the groves are here put metonymically for the idols of the groves, which are distinguished here from their Baalim, which seem to have been worshipped in other places, as the prophets of Baal are distinguished from the prophets of the groves, 1 Kings 18:19.