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

And the heavens shall declare his justice: for God is judge.

And the heavens shall declare his righteousness; for God executeth judgment himself. Selah.

And let the heavens make clear his righteousness; for God himself is the judge. (Selah.)

And the heavens shall declare his righteousness. The Jews were vain enough to imagine that their idle and fantastic service was the perfection of righteousness; but they are here warned by the prophet, that God, who had seemed to connive at their folly, was about to reveal his own righteousness from heaven, and expose their miserable devices. "Think you," as if he had said, "that God can take delight in the mockery of your deluded services? Though you send up the smoke of them to heaven, God will make known his righteousness in due time from above, and vindicate it from the dishonors done to it by your wicked inventions. The heavens themselves will attest your perfidy in despising true holiness, and corrupting the pure worship of God. He will no longer suffer your gratuitous aspersions of his character, as if he took no notice of the enmity which lurks under your pretended friendship." There is thus a cogency in the prophet's manner of treating his subject. Men are disposed to admit that God is judge, but, at the same time, to fabricate excuses for evading his judgment, and it was therefore necessary that the sentence which God was about to pronounce should be vindicated from the vain cavils which might be brought against it.

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.

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

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.