Exodus 29:9

You shall gird them with sashes, Aaron and his sons, and bind caps on them, and they shall have the priesthood by a perpetual statute. So you shall ordain Aaron and his sons.

Numbers 18:7

But you and your sons with you shall attend to your priesthood for everything concerning the altar and inside the veil, and you are to perform service. I am giving you the priesthood as a bestowed service, but the outsider who comes near shall be put to death.”

Leviticus 8:22-28

Then he presented the second ram, the ram of ordination, and Aaron and his sons laid their hands on the head of the ram.

Exodus 28:1

“Then bring near to yourself Aaron your brother, and his sons with him, from among the sons of Israel, to minister as priest to Me—Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.

Exodus 28:40-41

“For Aaron’s sons you shall make tunics; you shall also make sashes for them, and you shall make caps for them, for glory and for beauty.

Exodus 32:29

Then Moses said, “Dedicate yourselves today to the Lord—for every man has been against his son and against his brother—in order that He may bestow a blessing upon you today.”

Exodus 40:15

and you shall anoint them even as you have anointed their father, that they may minister as priests to Me; and their anointing will qualify them for a perpetual priesthood throughout their generations.”

Leviticus 8:33

You shall not go outside the doorway of the tent of meeting for seven days, until the day that the period of your ordination is fulfilled; for he will ordain you through seven days.

Numbers 3:10

So you shall appoint Aaron and his sons that they may keep their priesthood, but the layman who comes near shall be put to death.”

Numbers 16:10

and that He has brought you near, Korah, and all your brothers, sons of Levi, with you? And are you seeking for the priesthood also?

Numbers 16:35

Fire also came forth from the Lord and consumed the two hundred and fifty men who were offering the incense.

Numbers 16:40

as a reminder to the sons of Israel that no layman who is not of the descendants of Aaron should come near to burn incense before the Lord; so that he will not become like Korah and his company—just as the Lord had spoken to him through Moses.

Numbers 25:13

and it shall be for him and his descendants after him, a covenant of a perpetual priesthood, because he was jealous for his God and made atonement for the sons of Israel.’”

Deuteronomy 18:5

For the Lord your God has chosen him and his sons from all your tribes, to stand and serve in the name of the Lord forever.

Hebrews 5:4-5

And no one takes the honor to himself, but receives it when he is called by God, even as Aaron was.

Hebrews 5:10

being designated by God as a high priest according to the order of Melchizedek.

Hebrews 7:11-14

Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?

Hebrews 7:23-28

The former priests, on the one hand, existed in greater numbers because they were prevented by death from continuing,

Treasury of Scripture Knowledge

Summary

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.

Bible References

The priest's

Exodus 28:1
“Then bring near to yourself Aaron your brother, and his sons with him, from among the sons of Israel, to minister as priest to Me—Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.
Numbers 16:10
and that He has brought you near, Korah, and all your brothers, sons of Levi, with you? And are you seeking for the priesthood also?
Numbers 18:7
But you and your sons with you shall attend to your priesthood for everything concerning the altar and inside the veil, and you are to perform service. I am giving you the priesthood as a bestowed service, but the outsider who comes near shall be put to death.”
Hebrews 5:4
And no one takes the honor to himself, but receives it when he is called by God, even as Aaron was.
Hebrews 7:11
Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?