And there shall cleave nought of the cursed thing to thine
That is, they might not take anything whatever to their own use; for all being devoted to destruction, was cursed, and brought a curse upon the man that should make it his own property, as Achan did, when Jericho was destroyed:
that the Lord may turn from the fierceness of his anger;
stirred up by the idolatry of the city:
and show thee mercy, and have compassion upon thee;
who, seeing wrath gone forth, might dread the consequences, lest it should spread itself further:
and multiply thee, as he hath sworn to thy fathers;
Abraham, Isaac, and Jacob; this is observed to encourage them to execute his orders punctually in the destruction of the idolatrous city; since God could and would multiply them, as he had promised their fathers, with an oath, so that they should not be the fewer by such an instance of his severity.