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.

Did not Achan the son of Zerah,.... One that descended from Zerah the son of Judah, Joshua 7:18,

commit a trespass in the accursed thing; in taking what was devoted to sacred uses:

and wrath fell on all the congregation of Israel? and which was what was feared now; and this instance is brought to show that such fears were not groundless:

and that man perished not alone in his iniquity: which seems to confirm the notion of those who think that his children suffered with him; though it may be observed, that it was through his sin that thirty six men were slain by the men of Ai, Joshua 7:5.

He finally reminded them of the sin of Achan, how that had brought the wrath of God upon the whole congregation (Joshua 7); and, moreover, Achan was not the only man who had perished on account of the sin, but thirty-six men had fallen on account of it at the first attack upon Ai (Joshua 7:5). The allusion to this fact is to be understood as an argument a minori ad majus, as Masius has shown. "If Achan did not perish alone when he committed sacrilege, but God was angry with the whole congregation, what think ye will be the consequence if ye, so great a number, commit so grievous a sin against God?"

Did not Achan the son of Zerah commit a trespass in the accursed thing, and wrath fell on all the congregation of Israel? and that man {m} perished not alone in his iniquity.

(m) Signifying, that if many suffered for one man's sin, for the fault of many, all should suffer.

22:20 Of Zerah - That is, one of his posterity. Not alone - But brought destruction upon his whole family, and part of our forces sent against Ai.

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.