The Messiah would be God's messenger.
OT Prophecy NT Fulfillment
Isaiah 42:1a
[1] Behold my servant, whom I uphold; mine elect, in whom my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles.
John 4:34
Jesus saith unto them, My meat is to do the will of him that sent me, and to finish his work.

John 5:30
I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me.
Tanakh – Neviim – Isaiah 42:1a
[42:1] Behold My servant, whom I uphold; Mine elect, in whom My soul delighteth; I have put My spirit upon him, he shall make the right to go forth to the nations.
Hebrew OT – Isaiah 42:1a
[42:1] הֵן עַבְדִּי אֶתְמָךְ־בּוֹ
בְּחִירִי רָצְתָה נַפְשִׁי
נָתַתִּי רוּחִי עָלָיו
מִשְׁפָּט לַגּוֹיִם יוֹצִיא