Jehovah is King for ever and ever. David now, as if he had obtained the desires of his heart, rises up to holy rejoicing and thanksgiving. When he calls God King for ever and ever, it is a token of his confidence and joy. By the title of King, he vindicates God's claim to the government of the world, and when he describes him as King for ever and ever, this shows how absurd it is to think to shut him up within the narrow limits of time. As the course of human life is short, even those who sway the scepter over the greatest empires, being but mortal men, very often disappoint the expectations of their servants, as we are taught in Psalm 146:3, 4, "Put not your trust in princes, nor in the son of man, in whom there is no help. His breath goeth forth, he returneth to his earth; in that very day his thoughts perish." Often the power of giving assistance to others fails them, and while they are delaying to give it, the opportunity slips away from them. But we ought to entertain more exalted and honorable conceptions of our heavenly King; for although he does not immediately execute his judgments, yet he has always the full and the perfect power of doing so. In short, he reigns, not for himself in particular; it is for us that he reigns for ever and ever. As this, then, is the duration of his reign, it follows that a long delay cannot hinder him from stretching forth his hand in due season to succor his people, even when they are, as it were, dead, or in a condition which, to the eye of sense and reason, is hopeless. -- The heathen are perished out of the land The meaning is, that the holy land was at length purged from the abominations and impurities with which it had been polluted. It was a dreadful profanation, when the land which had been given for an inheritance to the people of God, and allotted to those who purely worshipped him, nourished ungodly and wicked inhabitants. By the heathen he does not mean foreigners, and such as did not belong to the race of Abraham according to the flesh, but hypocrites, who falsely boasted that they belonged to the people of God, just as at this day many, who are Christians only in name, occupy a place in the bosom of the Church. It is no new thing for the prophets to call apostates, who have degenerated from the virtues and holy lives of their fathers, by the reproachful name of heathen, and to compare them not only to the uncircumcised, but also to the Canaanites, who were the most detestable among all the heathen. "Thy father was an Amorite, and thy mother an Hittite," (Ezekiel 16:3) Many other similar passages are to be met with in Scripture. David, therefore, in applying the dishonorable name of heathen to the false and bastard children of Abraham, gives God thanks for having expelled such a corrupt class out of his Church. By this example we are taught, that it is no new thing if we see in our own day the Church of God polluted by profane and irreligious men. We ought, however, to beseech God quickly to purge his house, and not leave his holy temple exposed to the desecration of swine and dogs, as if it were a dunghill.

The Lord is King forever and ever - That is, he reigns, and he will reign forever. This is one of the instances which frequently occur in the Psalm, where, though there is a desponding spirit, or an apprehension of danger expressed in the beginning of the poem, it ends with the language of exultation and triumph. The psalmist speaks here as if what he had desired was actually accomplished, and as if the enemies that had encompassed him, and all the enemies of the Lord, were actually overthrown, and God now reigned supreme. He was so confident that this would be so, that he speaks of it as if it were already done. Compare Romans 4:17; see also Psalm 6:8-9; Psalm 7:17; Psalm 9:18.
The heathen are perished out of his land - That is, this would so certainly occur that he might speak of it as if it were actually done. The word "heathen" here refers to the enemies of God and of his cause, who are the principal subjects of the psalm. Compare Psalm 9:5. The "land," here, refers to the land of Palestine, or the holy land, regarded as a land sacred to God, or in the midst of which he himself dwelt.

The Lord is king for ever - He has, and ever will have, the supreme power.
The heathen are perished out of his land - They are all either cut off or converted. This may refer to the Canaanites. What a mercy that we can say this of our own country! Once it was entirely heathen; now not one heathen family in the whole land.

The LORD [is] King for ever and ever: the (k) heathen are perished out of his land.
(k) The hypocrites or such as live not after God's law, will be destroyed.

The Lord is King for ever and ever,.... Christ was King from everlasting, and during the Old Testament dispensation he was promised and prophesied of as King; and he had a kingdom when he was here on earth, though not of this world; nor was it with observation. At his ascension to heaven, and session at the right hand of God, he sat down upon the same throne with his Father, and was made or declared Lord and Christ, and appeared more visibly in his kingly office; and in the latter day it will be yet more manifest that he is King of saints, and when indeed he will be King over all the earth, and his kingdom will be an everlasting one: he will have no successor in it, nor will any usurper obtain any more; the devil, beast, and false prophet, will be cast into the lake of fire; all antichristian states will be destroyed, and all authority, rule, and power, put down; nor can his kingdom ever be subverted, he must reign till all enemies are put under his feet; he will reign to the end of the present world, and with the saints a thousand years in the new heaven and earth, and in the ultimate glory to all eternity; nor will his government cease when he shall have delivered up the kingdom to the Father, only the mode of the administration of it. Here begins the song of praise; the reign of Christ is matter of joy; see Psalm 97:1;
the Heathen are perished out of his land: not the seven nations which were driven out of the land of Canaan, to make way for the people of Israel, that was long ago; nor the wicked and degenerate Jews, called the Heathen, Psalm 2:1; compared with Acts 4:27; on whom, and on whose temple, city, and nation, Christ's native land, wrath is come to the uttermost; and they are perished out of it: nor hypocrites out of churches, which are Christ's property; but the antichristian party out of the world, which is Christ's land by creation, as God, and by the gift of his father to him, as Mediator. The followers of antichrist are called Gentiles, and the nations of the earth, Revelation 11:2; and these will be no more; they will be utterly destroyed, when the man of sin shall be consumed with the breath of Christ's mouth and the brightness of his coming. The seventh vial will clear the world of all the remains of Christ's enemies: this also is cause of rejoicing, Psalm 132:16.

God reigns. The wicked, if for a time successful, shall be cut off. He hears and confirms the hearts of His suffering people (Psalm 112:7), executes justice for the feeble, and represses the pride and violence of conceited, though frail, men (compare Psalm 9:16).

Is king - To whom it belongs to protect his subjects. Therefore his peoples case is never desperate, seeing he ever lives to help them. The heathen - The Canaanites; whom God, as king of the world, expelled, and gave their land to his people. By which great example he confirms his faith and hope for the future. His land - Out of Canaan, which God calls his land, because he gave it to them, and fixed his presence and dwelling in it.