91 Attention, Israel! 2 gigantic people, descendants of the Anakites - you've heard all about them; you've heard the saying, "No one can stand up to an Anakite." 3 Today know this: God, your God, is crossing the river ahead of you - he's a consuming fire. He will destroy the nations, he will put them under your power. You will dispossess them and very quickly wipe them out, just as God promised you would. 4 But when God pushes them out ahead of you, don't start thinking to yourselves, "It's because of all the good I've done that God has brought me in here to dispossess these nations." Actually it's because of all the evil these nations have done. 5 No, it's nothing good that you've done, no record for decency that you've built up, that got you here; it's because of the vile wickedness of these nations that God, your God, is dispossessing them before you so that he can keep his promised word to your ancestors, to Abraham, Isaac, and Jacob.
6 Know this and don't ever forget it: It's not because of any good that you've done that God is giving you this good land to own. Anything but! You're stubborn as mules.
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.