NET
4 The Lord makes this promise on oath and will not revoke it: “You are an eternal priest after the pattern of Melchizedek.”
Darby
4 Jehovah hath sworn, and will not repent, Thou art priest for ever after the order of Melchisedek.
KJV
4 The LORD hath sworn, and will not repent, Thou [art] a priest for ever after the order of Melchizedek.