Hebrews 5:4-5
Nor does any one take that high office upon himself, till he has been called to do so by God, as Aaron was.
Hebrews 5:10
while God himself pronounced him a High Priest of the order of Melchizedek.
Hebrews 7:11-14
If, then, Perfection had been attainable through the Levitical priesthood--and it was under this priesthood that the people received the Law--why was it still necessary that a priest of a different order should appear, a priest of the order of Melchizedek and not of the order of Aaron?
Hebrews 7:23-28
Again, new Levitical priests are continually being appointed, because death prevents their remaining in office;