Exodus 29:9

⁷  Then shalt thou take the anointing oil, and pour it upon his head, and anoint him.

⁸  And thou shalt bring his sons, and put coats upon them.

⁹  And thou shalt gird them with girdles, Aaron and his sons, and put the bonnets on them: and the priest's office shall be theirs for a perpetual statute: and thou shalt consecrate Aaron and his sons.

¹⁰  And thou shalt cause a bullock to be brought before the tabernacle of the congregation: and Aaron and his sons shall put their hands upon the head of the bullock.

¹¹  And thou shalt kill the bullock before the LORD, by the door of the tabernacle of the congregation.