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

Hebrews 5:6
And in another passage God says: "You are a priest forever 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 7:11
Now if perfection could have been attained through the Levitical priesthood (upon which 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 7:21
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.'"