Hebrews 9:16-22

Now a person’s last will and testament can only take effect after one has been proven to have died; otherwise the will cannot be in force while the person who made it is still alive. So this is why not even the first covenant was inaugurated without the blood of animals. For Moses ratified the covenant after he gave the people all the commandments of the law. He took the blood of calves and goats, with water, scarlet wool, and a hyssop branch, and sprinkled both the people and the book of the covenant, saying, “This is the blood of the covenant that God commands you to keep.” And later Moses also sprinkled the tabernacle with blood and every utensil and item used in their service of worship. Actually, nearly everything under the law was purified with blood, since forgiveness only comes through an outpouring of blood.