For the kingdom is the Lord's - The dominion belongs of right to Yahweh, the true God. See Matthew 6:13; Psalm 47:7-8.
And he is the governor among the nations - He is the rightful governor or ruler among the nations. This is an assertion of the absolute right of Yahweh to reign over the nations of the earth, and the expression of an assurance on the part of the Messiah that, as the consequence of his work, this empire of Yahweh over the nations would be actually established. Compare Daniel 7:13-14, note; Daniel 7:27, note; and 1-Corinthians 15:24-28, notes.

The kingdom is the Lord's - That universal sway of the Gospel which in the New Testament is called the kingdom of God; in which all men shall be God's subjects; and righteousness, peace, and joy in the Holy Ghost, be universally diffused.

For the kingdom is the Lord's,.... Not the kingdom of nature and providence, though that is the Lord Christ's; but the kingdom of grace, the mediatorial kingdom: this was Christ's by the designation and constitution of his Father from eternity; the government of the church was always upon his shoulders during the Old Testament dispensation; when he came into this world, he came as a King; though his kingdom being not of this world, it came not with observation; but upon his ascension to heaven, whither he went to receive a kingdom and return, he was made or declared Lord and Christ, and was exalted as a Prince, as well as a Saviour; and in consequence of his being set down at the right hand of God, he sent forth the rod of his strength, his Gospel, into the Gentile world, which was succeeded to the conversion of multitudes of them, among whom he has had a visible kingdom and interest ever since; and which will more abundantly appear in the latter day, when he shall be King over all the earth; and now this is a reason why so many, in the distant parts of the world, and among all the kindreds of the nations, shall remember, turn to him, and worship him;
and he is the Governor among the nations; he rules in the hearts of some by his Spirit and grace, and over others with a rod of iron.

For - This is added as a reason, why the Gentiles should be converted, because God is not only God and the Lord of the Jews, but also of the Gentiles, and of all nations.