Hebrews 9:18-22

This is why even the first agreement could not begin without blood to show death. First, Moses told all the people every command in the law. Next he took the blood of calves and mixed it with water. Then he used red wool and a branch of the hyssop plant to sprinkle it on the book of the law and on all the people. He said, “This is the blood that begins the Agreement that God commanded you to obey.” In the same way, Moses sprinkled the blood on the Holy Tent and over all the things used in worship. The law says that almost everything must be made clean by blood, and sins cannot be forgiven without blood to show death.