Matthew Poole and continuators on Joshua 22:17

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

i. e. Of our worshipping of Baal-Peor, Numb. 25.

For though God had pardoned it, as to the National Punishment of it, Numb. 25. 11. Yet they were not yet thorowly purged from it; partly because the shame and blot of that filthy and odious practise was not yet wiped of: 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 Ios. 24. 23. And God also took notice of these Idolatrous inclinations in particular persons, and found out ways to punish them one time or other.

Marginal references: Numb. 25. 4.