Exodus 24:5-6, 8

Then he sent young men of the children of Israel, who offered burnt offerings and sacrificed peace offerings of oxen to the LORD. And Moses took half the blood and put it in basins, and half the blood he sprinkled on the altar.

And Moses took the blood, sprinkled it on the people, and said, “This is the blood of the covenant which the LORD has made with you according to all these words.”