Hebrews 7:3, 15, 17, 21

without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like unto the Son of God), abideth a priest continually.

And what we say is yet more abundantly evident, if after the likeness of Melchizedek there ariseth another priest

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

(for they indeed have been made priests without an oath; but he with an oath by him that saith of him, The Lord sware and will not repent himself, Thou art a priest for ever)