Hebrews 9:9-14, 22

This is an example for the present time. It shows that the gifts and sacrifices offered cannot make the conscience of the worshiper perfect. These gifts and sacrifices were only about food and drink and special washings. They were rules for the body, to be followed until the time of God’s new way. But when Christ came as the high priest of the good things we now have, he entered the greater and more perfect tent. It is not made by humans and does not belong to this world. Christ entered the Most Holy Place only once—and for all time. He did not take with him the blood of goats and calves. His sacrifice was his own blood, and by it he set us free from sin forever. The blood of goats and bulls and the ashes of a cow are sprinkled on the people who are unclean, and this makes their bodies clean again. How much more is done by the blood of Christ. He offered himself through the eternal Spirit as a perfect sacrifice to God. His blood will make our consciences pure from useless acts so we may serve the living God.

The law says that almost everything must be made clean by blood, and sins cannot be forgiven without blood to show death.