Exodus 29:6 (KJV)

And this is the thing that thou shalt do unto them to hallow them, to minister unto me in the priest's office: Take one young bullock, and two rams without blemish,

And unleavened bread, and cakes unleavened tempered with oil, and wafers unleavened anointed with oil: of wheaten flour shalt thou make them.

And thou shalt put them into one basket, and bring them in the basket, with the bullock and the two rams.

And Aaron and his sons thou shalt bring unto the door of the tabernacle of the congregation, and shalt wash them with water.

And thou shalt take the garments, and put upon Aaron the coat, and the robe of the ephod, and the ephod, and the breastplate, and gird him with the curious girdle of the ephod:

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

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

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.

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.

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