Deuteronomy 9:3

Ver. 3. So shalt thou drive them out—quickly— Not the whole seven nations, whom, he had said before, God would drive out by little and little, chap. Deu 7:22 but so many as to make a settlement for the Israelites in Canaan. They were to attack the nations successively; but when they attacked one party, it is promised that they should destroy them quickly.