Exodus 29:1-14

“This is what you shall do to consecrate Aaron and his sons so that they may serve Me as priests: take one young bull and two rams, without blemish, and unleavened bread and unleavened cakes mixed with oil, and unleavened wafers spread with oil; you shall make them of fine wheat flour. You shall put them in one basket, and present them in the basket along with the bull and the two rams. Then bring Aaron and his sons to the doorway of the Tent of Meeting [out where the basin is] and wash them with water. Then you shall take the garments, and put on Aaron the tunic and the robe of the ephod and the ephod and the breastpiece, and wrap him with the skillfully woven sash of the ephod; and you shall put the turban on his head and put the holy crown on the turban. Then you shall take the anointing oil and pour it on his head and anoint him. You shall bring his sons and put tunics on them. And you shall wrap them with sashes, Aaron and his sons, and put the [ornamental] caps on them; and the priest’s office shall be theirs by a perpetual statute. So you shall ordain Aaron and his sons. “Then you shall bring the bull before the Tent of Meeting, and Aaron and his sons shall lay their hands on the bull’s head. Then you shall kill the bull before the LORD by the doorway of the Tent of Meeting. And you shall take some of the blood of the bull and with your finger put it on the horns of the altar [of burnt offering], and you shall pour out the remainder of the blood at the base of the altar. You shall take all the fat that covers the intestines and the lobe of the liver, and the two kidneys and the fat that is on them, and offer them up in smoke on the altar. But the meat of the bull, its hide, and the contents of its intestines you shall burn in the fire outside the camp; it is a sin offering. [Heb 13:11-13]