Psalms 106:34

34.They did not destroy the nations It appears to me that those persons are mistaken who think that the prophet is here simply giving a relation of the punishment which was inflicted upon the Jews, as if he were imputing to them the entire blame of not exterminating the nations, in consequence of their not deserving the honor of obtaining any more victories over them. But he rather prefers another charge against them, that they had been remiss in driving out the heathen, or more probably that they had not obeyed the Divine command to root them out of the land. Now that the cup of the iniquity of the Amorites was full, it was the purpose of God that they should be exterminated, lest their society might prove injurious to the holy people. For God, having chosen that land for a habitation to himself, intended that it should be holy and purified from all defilement. In refusing, therefore, to execute the vengeance enjoined upon them, the people showed their willingness to associate with the uncircumcised inhabitants of Canaan. In manifesting such indifference about God’s command respecting the driving out these nations, they gave just cause for his anger waxing hot against them. Behold, saith he, I have commanded all these nations to be cut off by the sword; and now, because ye have not obeyed my voice,

“they shall be pricks in your eyes, and thorns in your sides, and shall vex you in the land wherein ye dwell,” Numbers 33:55

The not destroying all these nations, but permitting some of them to remain, might appear to be an act of mercy; but in thus acting, the people were guilty of neglecting to execute God’s righteous vengeance upon them, and of leaving the land liable to be polluted with their abominations. From these things it ought to be noticed, that there are two extremes in which men are apt to indulge, either in being unnecessarily over rigorous, or in defeating the ends of justice by too great lenity. We must, therefore, adhere strictly to God’s command, if we would desire to shun both extremes. For if the Israelites are condemned for sparing some of these nations wholly, what are we to think of those judges who, from a timid and apathetic attention to the responsible duties of their office, exercise too much lenity to a few persons, thus weakening the restraints of the inlets to vice, to the great detriment of the public weal?