(3.) The reason they give for their concerning themselves so warmly in this matter is very sufficient. They were obliged to it, in their own necessary defence, by the law of self-preservation: "For, if you revolt from God to-day, who knows but to-morrow his judgments may break in upon the whole congregation (v. 18), as in the case of Achan? v. 20. He sinned, and we all smarted for it, by which we should receive instruction, and from what God did then infer what he may do, and fear what he will do, if we do not witness against your sin, who are so many, and punish it." Note, The conservators of the public peace are obliged, in justice to the common safety, to use their power for the restraining and suppressing of vice and profaneness, lest, if it be connived at, the sin thereby become national, and bring God's judgments upon the community. Nay, we are all concerned to reprove our neighbour when he does amiss, lest we bear sin for him, Lev. xix. 17.