Hebrews 7:22

20Inasmuch as he was not made priest without the taking of an oath

21(for they indeed have been made priests without an oath), but he with an oath by him that says of him, “The Lord swore and will not change his mind, ‘You are a priest forever, according to the order of Melchizedek.’”

22By so much, Jesus has become the guarantee of a better covenant.

23Many, indeed, have been made priests, because they are hindered from continuing by death.

24But he, because he lives forever, has his priesthood unchangeable.