Hebrews 5:6

5:6 as also in another place God says, “You are a priest forever in the order of Melchizedek.”

Hebrews 7:17

7:17 For here is the testimony about him: “You are a priest forever in the order of Melchizedek.”

Hebrews 7:24

7:24 but he holds his priesthood permanently since he lives forever.