Moses’ Teachings with their yearly cycle of sacrifices are only a shadow of the good things in the future. They aren’t an exact likeness of those things. They can never make those who worship perfect.
They serve at a place that is a pattern, a shadow, of what is in heaven. When Moses was about to make the tent, God warned him, “Be sure to make everything based on the plan I showed you on the mountain.”
The first part of the tent is an example for the present time. The gifts and sacrifices that were brought there could not give the worshiper a clear conscience.