ἱερωσύνη

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?

For the priesthood being changed, there is made of necessity a change also of the law.

For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.

But this man, because he continueth ever, hath an unchangeable priesthood.