Exodus 24:5-7

5Then he sent young Israelite men, and they offered burnt offerings and sacrificed young bulls as peace offerings to the Lord.

6Moses took half of the blood and put it in large basins, and [the other] half of the blood he sprinkled on the altar.

7Then he took the Book of the Covenant and read it aloud to the people; and they said, “Everything that the Lord has said we will do, and we will be obedient.”