Hebrews 10:1 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.

I left off yesterday saying that the law is a mirror to show us what we are, sinners. This prescription of sacrifices made under the Levitical law is a foreshadowing of things to come and not the express image of that thing itself, tells us that this also is an image of things to come.

Exodus 30:10 And Aaron shall make an atonement upon the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement upon it throughout your generations: it is most holy unto the Lord.

This atonement is upon the mercy seat of the Ark of the Covenant, once a year, blood for the sin offering. Aaron the first high priest, the first to receive instructions for the atonement of sin for the nation. He is a foreshadowing image of another high priest.

Hebrews 8:1-2 Now of the things which we have spoken this is the sum: We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens; A minister of the sanctuary, and of the true tabernacle, which the Lord pitched, and not man.

Hebrews 9:11-12 But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building; Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.