The reason the Lord is called King and [Jehovah’s] Anointed is that he was the Messiah or Christ, and “Messiah” or “Christ” means “King” and “Anointed One.” That is also why “King” in the Word means the Lord. Much the same was meant by David, who was king over Judah and over Israel.
We can see from many passages in the Word that the Lord was called “King” and “Jehovah’s Anointed.” That is why it says in Revelation, “The Lamb will overcome them, because he is Lord of Lords and King of Kings” (Revelation 17:14); and again, the one who sat on the white horse “had on his robe a name written—King of Kings and Lord of Lords” (Revelation 19:16).
It is because the Lord is called “King” that heaven and the church are called his kingdom and his Coming into the world is called the gospel of the kingdom.
On heaven and the church being called his kingdom, see Matthew 12:28; 16:28; Mark 1:14, 15; 9:1; 15:43; Luke 1:33; 4:43; 8:1, 10; 9:2, 11, 60; 10:11; 16:16; 19:11; 21:31; 22:18; 23:51;
and in Daniel:
God will raise up a kingdom that will never be destroyed. It will crush and devour all these other kingdoms, and it will stand forever. (Daniel 2:44)
In the same,
I was watching in the night visions, and behold, someone like the Son of Humanity was coming with the clouds of the heavens. To him was given dominion and glory and a kingdom, so that all peoples, nations, and tongues would worship him. His dominion is an everlasting dominion, and his kingdom is one that will not perish. (Daniel 7:13, 14, 27)
On his Coming being called “the gospel of the kingdom,” see Matthew 4:23; 9:35; 24:14. 43
from The Lord, Section 42