Hosea 9:9
They have deeply corrupted themselves, as in the days of Gibeah: therefore he will remember their iniquity, he will visit their sins. They have deeply corrupted themselves, as in the days of Gibeah: therefore he will remember their iniquity, he will visit their sins.
Israel had deeply corrupted itself by forgetting its Maker and giving itself over to idolatry. That corruption began with the introduction of the golden calves. From that first departure from the established worship it grew into the practices of nature-worship.
The depth of this corruption is set forth as like that in the days of Gibeah. It involved turning to Baal-peor and its shameful practices. By that idolatry the people abandoned every uplifting and ennobling principle.