Leviticus 4:3
If the anointed priest sins, bringing guilt on the people, he must bring to the LORD a young bull without blemish as a sin offering for the sin he has committed.

Leviticus 21:10, 11, 12
The priest who is highest among his brothers, who has had the anointing oil poured on his head and has been ordained to wear the priestly garments, must not dishevel his hair or tear his garments. . . .

Exodus 28:41
After you put these garments on your brother Aaron and his sons, anoint them, ordain them, and consecrate them so that they may serve Me as priests.

Exodus 29:7
Then take the anointing oil and anoint him by pouring it on his head.

Exodus 30:30
Anoint Aaron and his sons and consecrate them to serve Me as priests.

Psalm 133:2
It is like fine oil on the head, running down on the beard, running down Aaron's beard over the collar of his robes.