Joshua 22:15-20

Verse 17

Is the iniquity of Peor too little - See this history, Num 25:3 (note), etc., and the notes there. Phinehas takes it for granted that this altar was built in opposition to the altar of God erected by Moses, and that they intended to have a separate service, priesthood, etc., which would be rebellion against God, and bring down his curse on them and their posterity; and, in order to show that God is jealous of his glory, he refers to the business of Baal Peor, which took place in that very country they were now about to possess, the destructive consequences of which he, through his zeal for the glory of God, was the means of preventing.
Verse 19

If the land of your possessions be unclean - The generous mind of Phinehas led him to form this excuse for them. If ye suppose that this land is impure, as not having been originally included in the covenant, and ye think that ye cannot expect the blessing of God unless ye have an altar, sacrifices, etc., then pass ye over unto the land of the possession of the Lord, wherein the Lord's tabernacle dwelleth, the only legitimate place where sacrifices and offerings can be made. We will divide this land with you, and rather straiten ourselves than that you should conceive yourselves to be under any necessity of erecting a new altar besides the altar of the Lord our God.
Verse 20

Did not Achan the son of Zerah - Your sin will not be merely against yourselves; your transgressions will bring down the wrath of God upon all the people; this was the case in the transgression of Achan; he alone sinned, and yet God on that account turned his face against the whole congregation, so that they fell before their enemies. We cannot therefore be unconcerned spectators of your transgression, we may all be implicated in its criminality; let this and the dishonor which we apprehend is done to our God plead our excuse, and vindicate the necessity of the present warlike appearance which we make before you. See the history of Achan referred to here, (Joshua 7:11-26 (note)), and the notes there.
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