The Messiah would reveal that the Hebrew Scriptures were written of Him.

OT Prophecy NT Fulfillment
Psalm 40:6-8b
"[6] Sacrifice and offering thou didst not desire; mine ears hast thou opened: burnt offering and sin offering hast thou not required. [7] Then said I, Lo, I come: in the volume of the book it is written of me, [8] I delight to do thy will, O my God: yea, thy law is within my heart."
Luke 24:44
"And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me."
John 5:39-40
"[39] Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me. [40] And ye will not come to me, that ye might have life."

Tanakh - Ketuvim - Psalm 40:7-9b

"[7] Sacrifice and meal-offering Thou hast no delight in; mine ears hast Thou opened; burnt-offering and sin-offering hast Thou not required. [8] Then said I: 'Lo, I am come with the roll of a book which is prescribed for me; [9] I delight to do Thy will, O my G-d; yea, Thy law is in my inmost parts."

Hebrew OT - Psalms 40:7-9b

אל האטחו הלוע יל תירכ םינזא תצפח-אל החנמו חבז   [7]
.תלאש      
.ילע בותכ רפס-תלגמב יתאב-הנה יתרמא זא  [8]
.יעמ ךותב ךתרותו יתצפח יהלא ךנוצר-תושעל  [9]

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