Exodus 24
6 Ref And Moses took half the blood and put it in basins; draining out half of the blood over the altar.
7 Ref And he took the book of the agreement, reading it in the hearing of the people: and they said, Everything which the Lord has said we will do, and we will keep his laws.
8 Ref Then Moses took the blood and let it come on the people, and said, This blood is the sign of the agreement which the Lord has made with you in these words.