The Messiah would speak God's “Will and Word.”
OT Prophecy NT Fulfillment
Deuteronomy 18:18b
I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.
John 12:49
For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak.
Tanakh – Devarim – Deuteronomy 18:18b
I will raise them up a prophet from among their brethren, like unto thee; and I will put My words in his mouth, and he shall speak unto them all that I shall command him.
Hebrew OT – Deuteronomy 18:18b
[18:18] נָבִיא אָקִים לָהֶם מִקֶּרֶב אֲחֵיהֶם כָּמוֹךָ
וְנָתַתִּי דְבָרַי בְּפִיו וְדִבֶּר אֲלֵיהֶם אֵת כָּל־אֲשֶׁר אֲצַוֶּנּוּ