Hebrews 9:10, 13-14, 23

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.

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.

So the copies of the real things in heaven had to be made clean by animal sacrifices. But the real things in heaven need much better sacrifices.