Exodus 24:4-8
4 Moses wrote down all the words of the Lord. Then he got up early in the morning, and built an altar [for worship] at the foot of the mountain with twelve pillars (memorial stones) representing the twelve tribes of Israel.
5 Then he sent young Israelite men, and they offered burnt offerings and sacrificed young bulls as peace offerings to the Lord.
6 Moses took half of the blood and put it in large basins, and [the other] half of the blood he sprinkled on the altar.
7 Then 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.”
8 So Moses took the blood [which had been placed in the large basins] 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.”(A)