Exodus 24:5-8

He sent young men of the sons of Israel, and they offered burnt offerings and sacrificed young bulls as peace offerings to the LORD. Moses took half of the blood and put it in basins, and the other half of the blood he sprinkled on the altar. Then he took the book of the covenant and read it in the hearing of the people; and they said, “All that the LORD has spoken we will do, and we will be obedient!” So Moses took the blood and sprinkled it on the people, and said, “Behold the blood of the covenant, which the LORD has made with you in accordance with all these words.”