G2420–ἱερωσύνη–hierōsunē

Now if it was possible for things to be made complete through the priests of the house of Levi (for the law was given to the people in connection with them), what need was there for another priest who was of the order of Melchizedek and not of the order

ἱερωσύνης hi'erōsunēs “priesthood”

Because if the priests are changed, it is necessary to make a change in the law.

ἱερωσύνης hi'erōsunēs “priesthood”

But this priest, because his life goes on for ever, is unchanging.

ἱερωσύνην· hi'erōsunēn “priesthood;”