The consecration of the priests. See the notes to Leviticus 8–9.

Exodus 29:4: Door of the tabernacle - Entrance of the te…

And you shall kill the bullock before the Lord
That is, Moses is ordered to do it, who now officiated as a priest, "…

Aaron and his sons were to be set apart for the priest's office with ceremony and solemnity.

Our Lord Jesus is the great High Priest of our …