Exodus 29:9-11

King James Version

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.