The Messiah would be eternal.

OT Prophecy NT Fulfillment
Psalm 102:25-27a
"[25] Of old hast thou laid the foundation of the earth: and the heavens are the work of thy hands. [26] They shall perish, but thou shalt endure: yea, all of them shall wax old like a garment; as a vesture shalt thou change them, and they shall be changed: [27] But thou art the same, and thy years shall have no end."
Revelation 1:8
"I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty."
Hebrews 1:10-12
"[10] And, Thou, Lord, in the beginning hast laid the foundation of the earth; and the heavens are the works of thine hands: [11] They shall perish; but thou remainest; and they all shall wax old as doth a garment; [12] And as a vesture shalt thou fold them up, and they shall be changed: but thou art the same, and thy years shall not fail."

Tanakh - Ketuvim - Psalm 102:26-28a

"[26] Of old Thou didst lay the foundation of the earth; and the heavens are the work of Thy hands. [27] They shall perish, but Thou shalt endure; yea, all of them shall wax old like a garment; as a vesture shalt Thou change them, and they shall pass away; [28] But Thou art the selfsame, and Thy years shall have no end."

Hebrew OT - Psalms 102:26-28a

.םימש ךידי השעמו תדסי ץראה םינפל  [26]
םפילחת שובלכ ולבי דגבכ םלכו דמעת התאו ודבאי המה  [27]
.ופלחיו       
.ומתי אל ךיתונשו אוה-התאו  [28]

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