What is the “Heart of the Old Testament?” In Exodus 19:5-6 the Lord promises IF we will make a covenant with God and obey Him, THEN we will be a peculiar treasure, a kingdom of priests and priestesses, and 'an holy nation.' That is the heart of the Old Testament. God is working to draw us to Him and to refine us into a treasure. One way God does this is by giving us commandments (e.g., Exodus 20). All of the quotes that are used in this video can be found at BrotherMiller.org