91 "Hear, O Israel: you are to cross over the Jordan today, to go in to dispossess nations greater and mightier than yourselves, cities great and fortified up to heaven, 2 a people great and tall, the sons of the Anakim, whom you know, and of whom you have heard it said, 'Who can stand before the sons of Anak?' 3 Know therefore today that he who goes over before you as a consuming fire is the Lord your God. He will destroy them and subdue them before you. So you shall drive them out and make them perish quickly, as the Lord has promised you. 4 "Do not say in your heart, after the Lord your God has thrust them out before you, 'It is because of my righteousness that the Lord has brought me in to possess this land,' whereas it is because of the wickedness of these nations that the Lord is driving them out before you. 5 Not because of your righteousness or the uprightness of your heart are you going in to possess their land, but because of the wickedness of these nations the Lord your God is driving them out from before you, and that he may confirm the word that the Lord swore to your fathers, to Abraham, to Isaac, and to Jacob.
6 "Know, therefore, that the Lord your God is not giving you this good land to possess because of your righteousness, for you are a stubborn people.
Matthew Henry's Commentary on Deuteronomy 9:1-6
Commentary on Deuteronomy 9:1-6
(Read Deuteronomy 9:1-6)
Moses represents the strength of the enemies they were now to encounter. This was to drive them to God, and engage their hope in him. He assures them of victory, by the presence of God with them. He cautions them not to have the least thought of their own righteousness, as if that procured this favour at God's hand. In Christ we have both righteousness and strength; in Him we must glory, not in ourselves, nor in any sufficiency of our own. It is for the wickedness of these nations that God drives them out. All whom God rejects, are rejected for their own wickedness; but none whom he accepts are accepted for their own righteousness. Thus boasting is for ever done away: see Ephesians 2:9,11,12.