Numbers 21:2

Israel vowed a vow unto the Lord Being unexperienced in war, and sensible of their own weakness, they were afraid of these Canaanites, and therefore thus endeavour to engage God to help them in the war which they intended to renew. I will utterly destroy their cities I will reserve no person or thing for my own use, but devote them all to total destruction. The Israelites knew that the destruction of the seven nations of Canaan was predetermined in the counsels of heaven, on account of their excessive national wickedness, (Genesis 9:25,) and that it had only been deferred till their incorrigible iniquity, having baffled all the gentler methods of Providence, which, during the course of some hundreds of years, had been employed for their reformation, had proved itself to be full, as God himself expresses it, Genesis 15:16. They believed, it seems, that the time for effecting this destruction was now come, and hence made the vow here recorded.

The reader will observe, that it appears from all historical records of the seven Canaanitish nations, that before they were given up to utter destruction they were sunk into the deepest degeneracy and depravity. Thus (Leviticus 18.) where the Israelites are cautioned against the commission of several enormous crimes, such as offering their children to Moloch, lying with mankind as with womankind, lying with beasts, and women standing before beasts to lie down to them, it is added, For in all these the nations are defiled which I cast out before you. And again, For all these abominations have the men of the land done, which were before you. Thus it appears that the destined period for their extirpation was arrived; their iniquities were full, and they brought down this desolation upon themselves. It must be observed, however, that this decree of utter destruction only extended to the seven nations of Canaan, all, it seems, equally sunk in guilt and depravity. The Israelites were at liberty to offer, nay, were commanded to offer, peace to other cities or states that were not of those nations, on condition that they became tributaries to them. See the whole command on this subject, (Deuteronomy 20:10,) with the reason assigned for destroying the seven nations, which is thus expressed: That they teach you not to do after their abominations, which they have done unto their gods, so should you sin against the Lord your God. It may be proper to observe further here, that the extirpation of this people, so sunk in idolatry and wickedness, was intended to be a warning to the Israelites themselves, and a most awful one it certainly was; and it was one which they had great need of; for such was their proneness to idolatry in that age of the world, that nothing less seemed likely to be effectual to restrain them from it, than to impress their minds with the most horrid idea of that crime, as what rendered nations accursed in the sight of God and men, and destined to be utterly extirpated from the face of the earth.