Judge me, O Jehovah my God! David here confirms the prayer of the preceding verse that God would be his defender, and would maintain his righteous cause. Having been for a time subjected to suffering as one who had been forsaken and forgotten, he sets before himself the righteousness of God, which forbids that he should altogether abandon the upright and the just. It is, therefore, not simply a prayer, but a solemn appeal to God, that as he is righteous, he would manifest his righteousness in defending his servant in a good cause. And certainly, when we seem to be forsaken and deprived of all help, there is no remedy which we can employ, more effectual to overcome temptation than this consideration, that the righteousness of God, on which our deliverance depends, can never fail. Accordingly, the Apostle Paul, in exhorting the faithful to patience, says in 2-Thessalonians 1:6, "It is a righteous thing with God to recompense tribulation to them that trouble you." Now David again appeals to God in this place, and entreats him to manifest his righteousness in restraining the insolence of his enemies: for the more proudly they assail us, God is so much the more ready to help us. Besides, by again introducing them as speaking, he portrays in a graphic style the cruelty of their desires; and by this he means to show, that if things should happen according to their wishes, they would set no limit to their frowardness. But as the more they vaunt themselves, the more they provoke the wrath of God against them, David with good reason uses this as an argument to encourage his hope, and employs it for his support and confirmation in prayer.

Judge me, O Lord my God - Pronounce judgment, or judge between me and my enemies. Compare the notes at Psalm 26:1.
According to thy righteousness - That is, "rightly." Let there be a righteous judgment. The character of God, or the righteousness of God, is the highest standard of equity and justice, and the psalmist asks that he would manifest his real character as judge in interposing in behalf of an injured and oppressed man, and doing justice to him. When we are right in our own cause we may ask a just God to interpose and determine between us and our enemies according to his own nature. As between ourselves and our fellow-men we may bring our cause with this plea before a righteous God; as between ourselves and God, we can make no appeal to his "justice," but our only hope is in his "mercy."
And let them not rejoice over me - Let them not carry out their purposes; let them not be successful, so that they can appeal to the result as if they were right, and thus obtain a triumph over me. Compare Psalm 35:19.

Judge me, O Lord my God - The manner of his appeal shows the strong confidence he had in his own innocence.

Judge me, O LORD my God, according to thy (r) righteousness; and let them not rejoice over me.
(r) It is the justice of God to give to the oppressors affliction and torment, and to the oppressed aid and relief, (2-Thessalonians 1:6).

Judge me, O Lord my God, according to thy righteousness,.... Either that righteousness of his, by which he justifies his people, which Christ has wrought out, God has accepted of, and imputes; and which, though revealed in the Gospel, was witnessed to by the law and prophets, and was known to the saints under the Old Testament, and particularly to David; see Romans 4:6; or the perfection of his justice, his essential righteousness displayed in all his works and actions, and in the government of the world; according to this the psalmist desired to be judged; not with respect to his person before God, but with respect to his cause before men, by delivering him from his enemies, and taking vengeance on them: thus Christ also was judged according to the strict justice or righteousness of God; for as sin was righteously condemned in his flesh, being imputed to him, and found upon him; so he was, according to the justice of God, acquitted, discharged, and justified in the Spirit, when he arose from the dead; and afterwards righteous judgment was executed on his enemies the Jews, when wrath came upon them to the uttermost: and his people are also dealt with according to the righteousness of God; who acts as a righteous God, as just and faithful in forgiving their sins, on account of the blood of Christ being shed for it; and in justifying their persons by his righteousness, and by giving them the crown of righteousness laid up for them; and at last by rendering tribulation to them that have troubled them;
and let them not rejoice over me; meaning his enemies, as in Psalm 35:15; that is, let them not go on to rejoice; let them have no occasion for it, but deliver me out of their hands.