Psalms 50:6

6.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.