20:10-12 The Israelites are here directed about the nations on whom they made war. Let this show God's grace in dealing with sinners. He proclaims peace, and beseeches them to be reconciled. Let it also show us our duty in dealing with our brethren. Whoever are for war, we must be for peace. Of the cities given to Israel, none of their inhabitants must be left. Since it could not be expected that they should be cured of their idolatry, they would hurt Israel. These regulations are not the rules of our conduct, but Christ's law of love. The horrors of war must fill the feeling heart with anguish upon every recollection; and are proofs of the wickedness of man, the power of Satan, and the just vengeance of God, who thus scourges a guilty world. But how dreadful their case who are engaged in unequal conflict with their Maker, who will not submit to render him the easy tribute of worship and praise! Certain ruin awaits them. Let neither the number nor the power of the enemies of our souls dismay us; nor let even our own weakness cause us to tremble or to faint. The Lord will save us; but in this war let none engage whose hearts are fond of the world, or afraid of the cross and the conflict. Care is here taken that in besieging cities the fruit-trees should not be destroyed. God is a better friend to man than he is to himself; and God's law consults our interests and comforts; while our own appetites and passions, which we indulge, are enemies to our welfare. Many of the Divine precepts restrain us from destroying that which is for our life and food. The Jews understand this as forbidding all wilful waste upon any account whatsoever. Every creature of God is good; as nothing is to be refused, so nothing is to be abused. We may live to want what we carelessly waste.

Verses 16-20. - This was for cities at a distance; it was to be otherwise with the cities of the Canaanites. To them no offer of peaceful submission was to be made, and when the city was taken, all the inhabitants without reserve were to be destroyed. This was in accordance with God's command to Israel (Exodus 23:31-33; Exodus 34:11-16; Deuteronomy 7:1-3), and as a precaution against the risk of the people being seduced into idolatry by the heathen should they be allowed to remain in the land. But whilst engaged in besieging a town, they were not to destroy the fruit trees that were outside the walls; but trees that were not for food they might cut down and use in their operations against the city.

But of the cities of those people, which the Lord thy God doth give thee for an inheritance,.... The cities of the seven nations, six of which are mentioned by name in the next verse:

thou shalt save alive nothing that breatheth; the reason of this severity was because of their wickedness, the capital crimes and gross abominations they were guilty of, and for which they deserved to die; and on account whereof they were reserved to this destruction, when the measure of their iniquities was full, such as idolatry, incest, witchcraft, soothsaying, necromancy, &c. see Leviticus 18:3.

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