Exodus 24:6-8

And Moses took half of the blood and put it in basins, and half of the blood he dashed against the altar. Then he took the Book of the Covenant and read in the hearing of the people; and they said, All that the Lord has said we will do, and we will be obedient. And Moses took the [remaining half of 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. [I Cor. 11:25; Heb. 8:6; 10:28, 29.]