Exodus 29:1-37
“ Now this is what you shall do to them to consecrate them to serve as priests to Me: take one 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.And you shall put them in one basket, and present them in the basket along with the bull and the two rams.Then you shall bring Aaron and his sons to the doorway of the tent of meeting and wash them with water.And 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 his waist with the skillfully woven band of the ephod;and you shall set 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 also bring his sons and put tunics on them.And you shall wrap their waists with sashes, Aaron and his sons, and fit caps on them, and they shall have the priesthood by a permanent statute. So you shall ordain Aaron and his sons.“ Then you shall bring the bull in front of the tent of meeting, and Aaron and his sons shall lay their hands on the head of the bull.And you shall slaughter the bull before the Lord at the doorway of the tent of meeting.Then you shall take some of the blood of the bull and put it on the horns of the altar with your finger; and you shall pour out all the rest of the blood at the base of the altar.And you shall take all the fat that covers the entrails, 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 flesh of the bull and its hide and its refuse, you shall burn with fire outside the camp; it is a sin offering.“ You shall also take the one ram, and Aaron and his sons shall lay their hands on the head of the ram;and you shall slaughter the ram and take its blood and sprinkle it around on the altar.Then you shall cut the ram into its pieces, and wash its entrails and its legs, and put them with its pieces and its head.And you shall offer up in smoke the whole ram on the altar; it is a burnt offering to the Lord: it is a soothing aroma, an offering by fire to the Lord.“ Then you shall take the other ram, and Aaron and his sons shall lay their hands on the head of the ram.And you shall slaughter the ram, and take some of its blood and put it on the lobe of Aaron’s right ear and on the lobes of his sons’ right ears, and on the thumbs of their right hands, and on the big toes of their right feet, and sprinkle the rest of the blood around on the altar.Then you shall take some of the blood that is on the altar and some of the anointing oil, and sprinkle it on Aaron and on his garments, and on his sons and on his sons’ garments with him; so he and his garments shall be consecrated, as well as his sons and his sons’ garments with him.“ You shall also take the fat from the ram and the fat tail, and the fat that covers the entrails and the lobe of the liver, and the two kidneys and the fat that is on them, and the right thigh( for it is a ram of ordination),and one loaf of bread, and one cake of bread mixed with oil, and one wafer from the basket of unleavened bread which is set before the Lord;and you shall put all these in the hands of Aaron and in the hands of his sons, and shall wave them as a wave offering before the Lord.Then you shall take them from their hands, and offer them up in smoke on the altar on the burnt offering for a soothing aroma before the Lord; it is an offering by fire to the Lord.“ Then you shall take the breast of Aaron’s ram of ordination, and wave it as a wave offering before the Lord; and it shall be your portion.You shall consecrate the breast of the wave offering and the thigh of the contribution which was waved and which was offered from the ram of ordination, from the one which was for Aaron and from the one which was for his sons.It shall be for Aaron and his sons as their portion forever from the sons of Israel, for it is a contribution; and it shall be a contribution from the sons of Israel from the sacrifices of their peace offerings, their contribution to the Lord.“ The holy garments of Aaron shall be for his sons after him, so that they may be anointed and ordained in them.For seven days the one of his sons who is priest in his place shall put them on when he enters the tent of meeting to minister in the Holy Place.“ Now you shall take the ram of ordination and boil its flesh in a holy place.Then Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket, at the doorway of the tent of meeting.So they shall eat those things by which atonement was made at their ordination and consecration; but a layman shall not eat them, because they are holy.And if any of the flesh of ordination or any of the bread remains until morning, then you shall burn the remainder with fire; it shall not be eaten, because it is holy.“ So you shall do for Aaron and for his sons, according to all that I have commanded you; you shall ordain them for seven days.Each day you shall offer a bull as a sin offering for atonement, and you shall purify the altar when you make atonement for it, and you shall anoint it to consecrate it.For seven days you shall make atonement for the altar and consecrate it; then the altar shall be most holy, and whatever touches the altar shall be holy.
Numbers 18:1-7
So the Lord said to Aaron,“ You, your sons, and your father’s household with you shall bear the guilt in connection with the sanctuary, and you and your sons with you shall bear the guilt in connection with your priesthood.But also bring your brothers with you, the tribe of Levi, the tribe of your father, so that they may join you and serve you, while you and your sons with you are before the tent of the testimony.And they shall perform duties for you and the duties of the whole tent, but they shall not come near the furnishings of the sanctuary and the altar, or both they and you will die.They shall join you and perform the duties of the tent of meeting, for all the service of the tent; but an unauthorized person shall not come near you.So you shall perform the duties of the sanctuary and the duties of the altar, so that there will no longer be wrath on the sons of Israel.Behold, I Myself have taken your fellow Levites from among the sons of Israel; they are a gift to you, dedicated to the Lord, to perform the service for the tent of meeting.But you and your sons with you shall attend to your priesthood for everything that concerns the altar and inside the veil, and you are to perform service. I am giving you the priesthood as a service that is a gift, and the unauthorized person who comes near shall be put to death.”