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.

Then the children of Reuben, and the children of Gad, and the half tribe of Manasseh, answered,.... By some person whom they appointed to deliver the answer in their name:

and said unto the heads of the thousands of Israel; who were over those that were rulers of the thousands of Israel, persons of greater authority than they, being princes of the respective tribes to which they belonged.

CONTENTION THEREUPON. (Jos. 22:11-29)

and the children of Israel heard say--Fame speedily spread intelligence of what the trans-jordanic tribes had done. The act being suspected of some idolatrous design, the tribes rose in a mass, and repairing to the tabernacle at Shiloh, resolved to declare war against the two tribes and a half as apostates from God. On calmer and more mature consideration, however, they determined, in the first instance, to send a deputation consisting of the son of the high priest, and ten eminent persons from each tribe, to make inquiry into this rumored rebellion against God (Deu 13:13-15). The quality of the deputies evinced the deep solicitude that was felt on the occasion to maintain the purity of the divine worship throughout Israel. In the presumptive belief that the two tribes and a half had really built an altar, the deputies expressed astonishment at their so soon falling into such a heinous crime as that of violating the unity of divine worship (Exo 20:24; Lev 17:8-9; Deu 12:5-13). They reminded their eastern brethren of the disastrous consequences that were entailed on the nation at large by the apostasy at Peor and by the sin of Achan, and finally exhorted them, if they felt the want of the tabernacle and altar and repented of their rash choice in preferring worldly advantages to religious privileges, to remove to the western side of the Jordan, where all the tribes would form a united and obedient community of worshippers.