Is the iniquity of Peor too little for us, from which we are not {l} cleansed until this day, although there was a plague in the congregation of the LORD,

(l) Meaning, God is not fully pacified, in that no punishment can be sufficient for such wickedness and idolatry.

Wesley's Notes

22:17 Of Peor - That is, of our worshipping of Baal - peor, Numb 25:3. Probably this is mentioned the rather, because Phinehas, the first commissioner in this treaty, had signalized himself in that matter: and because they were now at or near the very place, where that iniquity was committed. Are not cleansed - For though God had pardoned it, as to the national punishment of it, Numb 25:11, yet they were not yet throughly purged from it; partly because the shame and blot of that odious practice was not yet wiped off: and partly, because some of that corrupt leaven still remained among them, and though smothered for a time, yet was ready to break forth upon all occasions, See Jos 24:33. And God also took notice of these idolatrous inclinations in particular persons, and found out ways to punish them.

Matthew Henry's Concise Commentary

22:10-20 Here is the care of the separated tribes to keep their hold of Canaan's religion. At first sight it seemed a design to set up an altar against the altar at Shiloh. God is jealous for his own institutions; we should be so too, and afraid of every thing that looks like, or leads to idolatry. Corruptions in religion are best dealt with at first. But their prudence in following up this zealous resolution is no less commendable. Many an unhappy strife would be prevented, or soon made up, by inquiries into the matter of the offence. The remembrance of great sins committed formerly, should engage us to stand on our guard against the beginnings of sin; for the way of sin is down-hill. We are all concerned to reprove our neighbour when he does amiss, lest we suffer sin upon him, Le 19:17. The offer made that they should be welcome to come to the land where the Lord's tabernacle was, and settle there, was in the spirit of true Israelites.