The book of the covenant refers to here is what we’ve read in the last three chapters of Exodus. Its now time to ratify the covenant and put it into action. The family of Aaron had not yet been chosen, so some scholars argue that the young men chosen to make the sacrifices were the firstborn of Israel. What’s important to us is that some people were assigned responsibilities for the sacrifices. Its significant that Moses took the blood of the sacrifices and sprinkled on the people after they assented to the covenant. The other half was sprinkled on the the altar. That declared a mutual bond of the people to God. Adam Clarke says: ” God was bound to the people to support, defend, and save them; the people were bound to God to fear, love and serve him”. The sprinkling on the altar indicated the willingness of the people to sacrifice their lives in the service of God, while the sprinkling on the people indicated a restored life back to the people under God. This covenant was based on the spoken words of God. The willingness to accept and obey God is always the basis of a relationship. In the new testament, Christ became the sacrifice, and we are still expected to be willing to walk with him in obedience. His blood on the cross became the final sprinkling. It takes a covenant to have a relationship with God. The Bible is a book of covenants.
And he took the book of the covenant, and read in the audience of the people: and they said, All that the Lord hath said will we do, and be obedient. Exodus 24:7 KJV