The high Priesthood of Christ rests upon the oath of God

^20-21 This means a “better” hope for us because Jesus has become our priest by the oath of God. Other men have been priests without any sworn guarantee, but Jesus has the oath of him that said of him: ‘The Lord has sworn and will not relent, You are a priest forever according to the order of Melchizedek’.

^22-25 And he is, by virtue of this fact, himself the living guarantee of a “better” agreement. Human High Priests have always been changing, for death made a permanent appointment impossible. But Christ, because he lives for ever, possesses a priesthood that needs no successor. This means that he can save fully and completely those who approach God through him, for he is always living to intercede on their behalf.