Hebrews 5:4-5
And no one takes the honor to himself, but, when called by God, as was also Aaron.
Hebrews 5:10
having been addressed by God as "High Priest according to the rank of Melchizedek."
Hebrews 7:11-14
If, therefore, there was perfection through the Levitical priesthood (for under it the people have received the law), what further need was there, that another Priest should arise according to the rank of Melchizedek, and not be reckoned according to the rank of Aaron?
Hebrews 7:23-28
And they, indeed, have been made priests many in number, because by death they are hindered from continuing;