Hebrews 9:22-23

22God's Law taught that blood was necessary to make almost everything clean. We see that God does not forgive people for their sins unless there is blood from a death.

23The tabernacle and the things that were in it needed animals' blood to make them clean. That was a picture of the true place in heaven where people worship God. But the true things in heaven need better sacrifices to make them clean than the sacrifices of animals.