So shalt thou drive them out, and destroy them quickly - This is not inconsistent with Deuteronomy 7:22, in which instant annihilation is not to be expected for the reasons assigned. Here Moses urges the people to trust in God’s covenanted aid; since He would then make no delay in so destroying the nations attacked by them as to put them into enjoyment of the promises, and in doing so as fast as was for the well-being of Israel itself.
Related Commentaries of Deuteronomy 9:3
Deuteronomy 9:3
3 Understand therefore this day, that the LORD thy God is he which goeth over before thee; as a consuming fire he shall destroy them, and he shall bring them down before thy face: so shalt thou drive them out, and destroy them quickly, as the LORD hath said unto thee.