The LORD hath sworn, and will not repent, Thou [art] a priest for ever after the order of (d) Melchizedek.
(d) As Melchizedek the figure of Christ was both a King and Priest, so this effect cannot be accomplished on any king save only Christ.
Related Commentaries of Psalms 110:4
Psalms 110:4
4 The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.