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 - This relates to that shocking rape and murder of the Levite's wife, mentioned Judges 19:16, etc.
Related Commentaries of Hosea 9:9
Hosea 9:9
9 They have deeply corrupted themselves, as in the days of Gibeah: therefore he will remember their iniquity, he will visit their sins.