Exodus 24:4-8

4And Moses wrote down all the words of the Lord. He rose early the next morning and set up an altar and twelve pillars for the twelve tribes of Israel at the base of the mountain.

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

6Moses took half the blood and set it in basins; the other half of the blood he splattered on the altar.

7He then took the covenant scroll and read it aloud to the people. They responded, “We will do and obey all that the Lord has commanded.”

8Moses took the blood, splattered it on the people, and said, “This is the blood of the covenant that the Lord has made with you concerning all these words.”