'Order of Melchizedek' in the Bible

LORD has sworn, and will not repent. Thou are a priest forever after the order of Melchizedek.

(And just as he says in another, Thou are a priest into the age according to the order of Melchizedek.)

having been designated by God a high priest according to the order of Melchizedek.

where the forerunner, Jesus, entered for us, having become a high priest into the age according to the order of Melchizedek.

If indeed therefore perfection was through the Levitical priesthood (for under it the people had received the law), what further need is there for another priest to arise according to the order of Melchizedek, and not be designated

For he testifies, Thou are a priest into the age according to the order of Melchizedek.

but he with an oath, because of him who says to him, The Lord swore and will not change his mind, Thou are a priest into the age according to the order of Melchizedek.