Deuteronomy 7

Here in this chapter we read of Moses instructing Israel to not have anything to do with the people they are about to dispossess.  They are to destroy them including anything that had to do with their idolatrous religion. They are to do this because they are God's chosen people, whom He delivered out of Egypt, the descendants of their fathers whom God made a covenant with. Thus, they are a holy people and they must separate from anything pagan.

God made a covenant with them that comprises blessings on obedience and blastings upon disobedience. God will surely act accordingly. Thus, they must be obedient.

Then Moses enumerated the blessings that will surely come upon their obedience.

Should they be intimidated with the people, whose lands they are about to possesses, they must not repeat the folly of their fathers years before. Instead of looking upon their enemies, their eyes must be on God. He will surely undertake for them.

Then Moses reiterated again the importance of not having anything to do with idolatry.