The first High Priest, Aaron, was presented to the congregation. He and his sons then washed at the laver. This washing speaks of the sinfulness of Aaron and his sons who could not truly represent the sinlessness of Yeshua.
Exodus 29:4 And Aaron and his sons thou shalt bring unto the door of the tabernacle of the congregation, and shalt wash them with water.
Yeshua was also announced and washed.
John 1:29 The next day John seeth Yeshua (Jesus) coming unto him, and saith, Behold the Lamb of G-d, which taketh away the sin of the world.
After Aaron put on the garments of the High Priest he was anointed with oil.
Exodus 29:7 Then shalt thou take the anointing oil, and pour it upon his head, and anoint him.
The oil that was poured on Aaron's head ran down on his beard and garments. This method of anointing was only used for the High Priest. The High Priest is referred to as the priest that is anointed. (Lev 4:5, 16, 6:22 and Num 35:25)
John 1:41 "The first thing he did was to find his brother Shim'on and tell him, 'We've found the Mashiach!" (The word means "one who has been anointed.")
Yeshua is our anointed High Priest. (Hebrews will refer to this also.)
The oil represents Ruach HaKodesh (The Holy Spirit) being poured out upon Yeshua our High Priest. When Yeshua was baptized in the Jordan River Ruach HaKodesh descended upon Him like a dove.
Matthew 3:16 And Yeshua (Jesus), when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw Ruach HaKodesh (Spirit of G-d) descending like a dove, and lighting upon him:
Part of consecrating the High Priest was a burnt offering. Then the blood of the offering was applied to the High Priest and his sons.
Leviticus 8:23 And he slew it; and Moshe took of the blood of it, and put it upon the tip of Aaron's right ear, and upon the thumb of his right hand, and upon the great toe of his right foot.
The application of the blood to the ear signified that they were to hear and obey G-d's laws; its application to the thumb signified the use of their hands for priestly work and the application to the toe signified they were to walk in His ways.