And in another passage God says: "You are a priest forever in the order of Melchizedek."

Genesis 14:18
Then Melchizedek king of Salem brought out bread and wine--since he was priest of God Most High--

Psalm 110:4
The LORD has sworn and will not change His mind: "You are a priest forever in the order of Melchizedek."

Hebrews 5:10
and was designated by God as high priest in the order of Melchizedek.

Hebrews 6:20
where Jesus our forerunner has entered on our behalf. He has become a high priest forever in the order of Melchizedek.

Hebrews 7:8
In the case of the Levites, mortal men collect the tenth; but in the case of Melchizedek, it is affirmed that he lives on.

Hebrews 7:11
Now if perfection could have been attained through the Levitical priesthood (for on this basis the people received the law), why was there still need for another priest to appear--one in the order of Melchizedek and not in the order of Aaron?

Hebrews 7:17
For it is testified: "You are a priest forever in the order of Melchizedek."

Hebrews 7:21
but Jesus became a priest with an oath by the One who said to Him: "The Lord has sworn and will not change His mind: 'You are a priest forever.'"

As he said also in another place, You are a priest for ever after the order of Melchisedec.