Moses asks Israel to listen to the statutes and rules he teaches them, so that they may live and enter to possess the land. They must not add to or take from what he commands. He reminds them of what happened at Baal-peor, where the Lord destroyed those who followed that god, while those who held fast are alive to this day. Keeping the law will make them look like a wise and understanding people to the nations, who will ask what great nation has a God so near.
Moses orders them to teach all this to their children and recalls the day at Horeb, when they heard the Lord's voice from the fire but saw no form. There God declared his covenant, the ten commandments, which he wrote on two tablets of stone. So they must take care not to make any image, of man or animal, or worship the sun, moon or stars, because the Lord is a consuming fire, a jealous God.
Moses warns that if, once settled in the land, they make idols, they will be scattered among the peoples. But he adds hope: from there they will seek the Lord and find him if they seek him with all their heart, because he is a merciful God who will not abandon them or forget his covenant. He asks whether any people ever heard the voice of God from the fire and lived, and concludes that the Lord is God in heaven above and on earth below, and there is no other.
The chapter closes with three cities of refuge east of the Jordan, Bezer, Ramoth and Golan, and with the introduction to the law that Moses will set out in the valley opposite Beth-peor.