TSK · Exodus 29:9

In the tabernacle of the congregation without the vail, which [is] before the testimony, Aaron and his sons shall order it from evening to morning before the LORD: [it shall be] a statute for ever unto their generations on the behalf of the children of Israel.

¶ And for Aaron's sons thou shalt make coats, and thou shalt make for them girdles, and bonnets shalt thou make for them, for glory and for beauty.

And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest's office: for their anointing shall surely be an everlasting priesthood throughout their generations.

And ye shall not go out of the door of the tabernacle of the congregation [in] seven days, until the days of your consecration be at an end: for seven days shall he consecrate you.

And he hath brought thee near [to him], and all thy brethren the sons of Levi with thee: and seek ye the priesthood also?

[To be] a memorial unto the children of Israel, that no stranger, which [is] not of the seed of Aaron, come near to offer incense before the LORD; that he be not as Korah, and as his company: as the LORD said to him by the hand of Moses.

And he shall have it, and his seed after him, [even] the covenant of an everlasting priesthood; because he was zealous for his God, and made an atonement for the children of Israel.

And the man Micah had an house of gods, and made an ephod, and teraphim, and consecrated one of his sons, who became his priest.

And no man taketh this honour unto himself, but he that is called of God, as [was] Aaron.

¶ If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need [was there] that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?