They have deeply corrupted themselves - Literally, "they have gone deep, they are corrupted." They have deeply immersed themselves in wickedness; have gone to the greatest depth they could, in it; they are sunk in it, so that they could hardly be extricated from it; and this, of their own deliberate intent; they contrived it deeply, hiding themselves, as they hoped, from God.

As in, the days of Gibeah - When Benjamin espoused the cause of "the children of Belial" who had worked such horrible brutishness in Gibeah toward the concubine of the Levite. This they maintained with such obstinacy, that, through God's judgment, the whole tribe perished, except six hundred men. Deeply they must have already corrupted themselves, who supported such guilt. Such corruption and such obstinacy was their's still.

Therefore "he will remember their iniquity." God seemed for a time, as if He overlooked the guilt of Benjamin in the days of Gibeah, for at first He allowed them to be even victorious over Israel, yet in the end, they were punished, almost to extermination, and Gibeah was destroyed. So now, although He bore long with Ephraim, He would, in the end show that He remembered all by visiting all.

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.

They have deeply corrupted themselves, as in the days of Gibeah,.... Not the false prophets and watchmen only; but rather Ephraim, or the ten tribes, through their means became extremely corrupt in principle and practice; they had most sadly degenerated, and were deeply sunk and immersed in all manner of wickedness, and rooted in it, and continued obstinate and incorrigible, so that there was no hope of reformation among them; they had got to as great a pitch of wickedness, and were guilty of the like uncleanness, lewdness, barbarity, and cruelty, as were acted by the men of Gibeah, with respect to the Levite and his concubine, Judges 19:1; for Gibeah of Benjamin is here meant, where the people asked a king, and rebelled against the words of the prophet, as some in Jarchi interpret it:

therefore he will remember their iniquity, he will visit their sins: that is, God, my God, as the prophet calls him in Hosea 9:8, will not forgive and forget their sins; pardon being often expressed by a non-remembrance of sins; but will make inquiry after them, and visit them in a way of wrath and vengeance, and punish for them as they deserve: they being obstinate and impenitent, and persisting in their sins, like the men of Gibeah and Benjamin.

They {k} have deeply corrupted themselves, as in the days of Gibeah: therefore he will remember their iniquity, he will visit their sins.

(k) This people is so rooted in their wickedness, that Gibeah, which was similar to Sodom, was never more corrupt; Jud 19:22.

9. as in the days of Gibeah-as in the day of the perpetration of the atrocity of Gibeah, narrated in Jud 19:16-22, &c.

9:7-10 Time had been when the spiritual watchmen of Israel were with the Lord, but now they were like the snare of a fowler to entangle persons to their ruin. The people were become as corrupt as those of Gibeah, Jud 19; and their crimes should be visited in like manner. At first God had found Israel pleasing to Him, as grapes to the traveller in the wilderness. He saw them with pleasure as the first ripe figs. This shows the delight God took in them; yet they followed after idolatry.