Priesthood

Leviticus 8:1-21
Moses consecrate them, sprinkled some of the oil on the altar seven times, all garment and utensils and the basin with its stand, etc.
Moses did burnt offering for Aaron and his sons, as the Lord commanded Moses.
Now the priest's sacrificial duties have been listed, Moses implements the instructions given in Exodus 29. In an elaborate and impressive ritual Aaron and his sons are instituted to the priesthood.
Mose performs the priestly duties on their behalf.
Why?
Moses did what the Lord commanded him. The honest servant of the Lord!
To be a priest have to be consecreted whole body and heart, mind. Clean the body is easy, but clean the heart and mind are more difficult, unless the help of Holy Spirit.
How?
Separate from the world, clean my heart, my mind and be an honest servant of the Lord.