The Messiah would have complete authority over all things.
OT Prophecy NT Fulfillment
Psalm 2:8
"Ask of me, and I shall give thee the heathen for thine inheritance, and the uttermost parts of the earth for thy possession."
Matthew 28:18
"And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth."

Hebrews 1:1–2
[1] God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
[2] Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;
Tanakh – Ketuvim – Psalms 2:8
"Ask of Me, and I will give the nations for thine inheritance, and the ends of the earth for thy possession."
Hebrew OT – Psalms 2:8
[2:8] שְׁאַל מִמֶּנִּי
וְאֶתְּנָה גּוֹיִם נַחֲלָתֶךָ
וַאֲחֻזָּתְךָ אַפְסֵי־אָרֶץ