Exodus 29:35-37
This is what you are to do for Aaron and his sons based on all that I have commanded you, taking seven days to ordain them. / Sacrifice a bull as a sin offering each day for atonement. Purify the altar by making atonement for it, and anoint it to consecrate it. / For seven days you shall make atonement for the altar and consecrate it. Then the altar will become most holy; whatever touches the altar will be holy.

Numbers 3:3
These were Aaron’s sons, the anointed priests, who were ordained to serve as priests.

Hebrews 5:1-4
Every high priest is appointed from among men to represent them in matters relating to God, to offer gifts and sacrifices for sins. / He is able to deal gently with those who are ignorant and misguided, since he himself is subject to weakness. / That is why he is obligated to offer sacrifices for his own sins, as well as for the sins of the people. ...

Exodus 40:12-15
Then bring Aaron and his sons to the entrance to the Tent of Meeting and wash them with water. / And you are to clothe Aaron with the holy garments, anoint him, and consecrate him, so that he may serve Me as a priest. / Bring his sons forward and clothe them with tunics. ...

Numbers 8:5-22
Again the LORD spoke to Moses, saying, / “Take the Levites from among the Israelites and make them ceremonially clean. / This is what you must do to cleanse them: Sprinkle them with the water of purification. Have them shave their whole bodies and wash their clothes, and so purify themselves. ...

Hebrews 7:26-28
Such a high priest truly befits us—One who is holy, innocent, undefiled, set apart from sinners, and exalted above the heavens. / Unlike the other high priests, He does not need to offer daily sacrifices, first for His own sins and then for the sins of the people; He sacrificed for sin once for all when He offered up Himself. / For the law appoints as high priests men who are weak; but the oath, which came after the law, appointed the Son, who has been made perfect forever.

Exodus 28:1-3
“Next, have your brother Aaron brought to you from among the Israelites, along with his sons Nadab, Abihu, Eleazar, and Ithamar, to serve Me as priests. / Make holy garments for your brother Aaron, to give him glory and splendor. / You are to instruct all the skilled craftsmen, whom I have filled with a spirit of wisdom, to make garments for Aaron’s consecration, so that he may serve Me as priest.

Numbers 18:1-7
So the LORD said to Aaron, “You and your sons and your father’s house must bear the iniquity involving the sanctuary. And you and your sons alone must bear the iniquity involving your priesthood. / But bring with you also your brothers from the tribe of Levi, the tribe of your father, that they may join you and assist you and your sons before the Tent of the Testimony. / And they shall attend to your duties and to all the duties of the Tent; but they must not come near to the furnishings of the sanctuary or the altar, or both they and you will die. ...

Hebrews 9:6-10
When everything had been prepared in this way, the priests entered regularly into the first room to perform their sacred duties. / But only the high priest entered the second room, and then only once a year, and never without blood, which he offered for himself and for the sins the people had committed in ignorance. / By this arrangement the Holy Spirit was showing that the way into the Most Holy Place had not yet been disclosed as long as the first tabernacle was still standing. ...

Exodus 29:1-9
“Now this is what you are to do to consecrate Aaron and his sons to serve Me as priests: Take a young bull and two rams without blemish, / along with unleavened bread, unleavened cakes mixed with oil, and unleavened wafers anointed with oil. Make them out of fine wheat flour, / put them in a basket, and present them in the basket, along with the bull and the two rams. ...

1 Samuel 2:28
And out of all the tribes of Israel I selected your father to be My priest, to offer sacrifices on My altar, to burn incense, and to wear an ephod in My presence. I also gave to the house of your father all the food offerings of the Israelites.

Hebrews 10:11-14
Day after day every priest stands to minister and to offer again and again the same sacrifices, which can never take away sins. / But when this Priest had offered for all time one sacrifice for sins, He sat down at the right hand of God. / Since that time, He waits for His enemies to be made a footstool for His feet, ...

Exodus 40:13-16
And you are to clothe Aaron with the holy garments, anoint him, and consecrate him, so that he may serve Me as a priest. / Bring his sons forward and clothe them with tunics. / Anoint them just as you anointed their father, so that they may also serve Me as priests. Their anointing will qualify them for a permanent priesthood throughout their generations.” ...

1 Chronicles 23:13
The sons of Amram: Aaron and Moses. Aaron and his descendants were set apart forever to consecrate the most holy things, to burn incense before the LORD, to minister before Him, and to pronounce blessings in His name forever.

Hebrews 8:3-6
And since every high priest is appointed to offer both gifts and sacrifices, it was necessary for this One also to have something to offer. / Now if He were on earth, He would not be a priest, since there are already priests who offer gifts according to the law. / The place where they serve is a copy and shadow of what is in heaven. This is why Moses was warned when he was about to build the tabernacle: “See to it that you make everything according to the pattern shown you on the mountain.” ...