The Messiah would be a Priest after the order of Melchisedec.

OT Prophecy NT Fulfillment
Psalm 110:4
"The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek."
Hebrews 6:17-20
"[17] Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath: [18] That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: [19] Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil; [20] Whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec."

Tanakh - Ketuvim - Psalm 110:4

"HaShem hath sworn, and will not repent: 'Thou art a priest for ever after the manner of Melchizedek.'"

Hebrew OT - Psalms 110:4

יתרבד-לע םלועל ןהכ-התא םחני אלו הוהי עבשנ
.קדצ-יכלמ

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