And the heavens shall declare his righteousness - Shall make it known, or announce it. That is, the heavens - the heavenly inhabitants - will bear witness to the justness of the sentence, or will approve the sentence. See the notes at Psalm 50:4. Compare Psalm 97:6.

For God is judge himself - The judgment is not committed to mortal men, or even to angels. Creatures, even the most exalted and pure, might err in such a work as that of judging the world. That judgment, to be correct, must be founded on a perfect knowledge of the heart, and on a clear and complete understanding of all the thoughts, the motives, the words, the deeds of all people. It cannot be supposed that any created being, however exalted, could possess all this knowledge, and it cannot be supposed that any created being, however pure, could be so endowed as to be secure against error in pronouncing a judgment on the countless millions of people. But God combines all these in himself; a perfect knowledge of all that has ever occurred on earth, and of the motives and feelings of every creature - and, at the same time, absolute purity and impartiality; therefore his judgment must be such that the universe will see that it is just. It may be added here that as the New Testament has stated (see the notes at Psalm 50:3) that the judgment of the world in the last day will be committed to the Lord Jesus Christ, the considerations just suggested prove that he is Divine. The immediate point in the passage before us is, that the fact that "God" will preside in the judgment, demonstrates that the acts of judgment will be "right," and will be such as the "heavens" - the universe - will approve; such, that all worlds will proclaim them to be right. There is no higher evidence that a thing is right, and that it ought to be done, than the fact that God has done it. Compare Genesis 18:25; Psalm 39:9.

And the heavens shall declare his righteousness,.... That is, either the heavens shall bear witness to his justice and equity in judging his people; or the angels, the ministers of the Gospel, shall declare his justifying righteousness, which is revealed in it, to the saints and covenant ones they shall be a means of gathering in: or rather the justice of Christ in the destruction of the Jews shall be attested and applauded by angels and men, just as the righteousness of God in the destruction of the antichristian powers is celebrated by the angel of the waters, Revelation 16:5;

for God is Judge himself. And not another, or by another; and therefore his judgments must be just and righteous, seeing he is just and true, loves righteousness, and is righteous in all his ways and works.

Selah; on this word; see Gill on Psalm 3:2.

And the heavens shall declare his righteousness: for God is judge himself. Selah.

50:6 Declare - God will convince the people of his righteousness, and of their own wickedness, by thunders and lightnings, and storms, or other dreadful signs wrought by him in the heavens. Himself - In his own person. God will not now reprove them, by his priests or prophets, but in an extraordinary manner from heaven.

6. The inhabitants of heaven, who well know God's character, attest His righteousness as a judge.

50:1-6 This psalm is a psalm of instruction. It tells of the coming of Christ and the day of judgment, in which God will call men to account; and the Holy Ghost is the Spirit of judgement. All the children of men are concerned to know the right way of worshipping the Lord, in spirit and in truth. In the great day, our God shall come, and make those hear his judgement who would not hearken to his law. Happy are those who come into the covenant of grace, by faith in the Redeemer's atoning sacrifice, and show the sincerity of their love by fruits of righteousness. When God rejects the services of those who rest in outside performances, he will graciously accept those who seek him aright. It is only by sacrifice, by Christ, the great Sacrifice, from whom the sacrifices of the law derived what value they had, that we can be accepted of God. True and righteous are his judgments; even sinners' own consciences will be forced to acknowledge the righteousness of God.