Exodus 29:9

“In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before Yahweh; it shall be a perpetual statute throughout their generations for the sons of Israel.

“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.

“You shall put them on Aaron your brother and on his sons with him; and you shall anoint them and ordain them and set them apart as holy, that they may minister to Me as priests.

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

Next Moses brought Aaron’s sons near and clothed them with tunics and girded them with sashes and bound caps on them, just as Yahweh had commanded Moses.

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

“But you and your sons with you shall keep your priesthood in everything that concerns 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.”

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

“For Yahweh your God has chosen him and his sons from all your tribes, to stand to minister in the name of Yahweh all the days.

“Therefore Yahweh, the God of Israel, declares, ‘I did indeed say that your house and the house of your father should walk before Me forever’; but now Yahweh declares, ‘Far be it from Me—for those who honor Me I will honor, and those who despise Me will be cursed.

“When the priests enter, then they shall not go out into the outer court from the sanctuary without laying there their garments in which they minister, for they are holy. They shall put on other garments; then they shall come near to that which is for the people.”