Psalms 7:8

David flees to God for succour. But Christ alone could call on Heaven to attest his uprightness in all things. All His works were wrought in righteousness; and the prince of this world found nothing whereof justly to accuse him. Yet for our sakes, submitting to be charged as guilty, he suffered all evils, but, being innocent, he triumphed over them all. The plea is, "For the righteous God trieth the hearts and the reins." He knows the secret wickedness of the wicked, and how to bring it to an end; he is witness to the secret sincerity of the just, and has ways of establishing it. When a man has made peace with God about all his sins, upon the terms of grace and mercy, through the sacrifice of the Mediator, he may, in comparison with his enemies, appeal to God's justice to decide.

If I am not mistaken, David has now seen in the eye of his mind the Lord ascending to his judgment-seat, and beholding him seated there in royal state, he draws near to him to urge his suit anew. In the last two verses he besought Jehovah to arise, and now that he is arisen, he prepares to mingle with "the congregation of the people" who compass the Lord about. The royal heralds proclaim the opening of the court with the solemn words, "The Lord shall judge the people." Our petitioner rises at once, and cries with earnestness and humility, "Judge me, O Lord, according to my righteousness, and according to mine integrity that is in me." His hand is on an honest heart, and his cry is to a righteous Judge.