Deuteronomy 11 - Moses expressed God's desire that the Israelites would carefully and deliberately keep His commandments. This not only would assure them of God's blessing on their lives but He would also drive out the nations who were currently residing in Canaan. The Law had blessings for obedience and curses for disobeying. These blessings and curses were to be read on two mountains when Israel entered the Promised Land.
Deuteronomy 12 - God wanted Israel to focus on one place of worship when they offered their sacrifices and when they met together for their yearly feasts and festivals. This would serve the purpose of keeping all the tribes in fellowship with one another and remind them that they were all part of the people of God. This would also assure them that their worship was in harmony with what God wanted and not patterned after the idolatry of the nations around them,
Deuteronomy 13 - God's prophets were to be listened to for they taught and explained God's Laws to His people. Anyone who taught them differently was to be considered a false prophet and they were to be executed. If a whole town was given over to idolatry the rest of the nation was to judge them severely after properly investigating the allegations. God has always placed high priority on knowing the truth, believing the truth, and teaching the truth. God and truth are united together.