'Order of Melchizedek' in the Bible

as he saith also in another place, Thou art a priest for ever After the order of Melchizedek.

named of God a high priest after the order of Melchizedek.

whither as a forerunner Jesus entered for us, having become a high priest for ever after the order of Melchizedek.

Now if there was perfection through the Levitical priesthood (for under it hath the people received the law), what further need was there that another priest should arise after the order of Melchizedek, and not be reckoned after the order of Aaron?

for it is witnessed of him, Thou art a priest for ever After the order of Melchizedek.