Debate thy cause, and redeem me. In this verse David specifics the kind of his affliction, which was the wrongful and harassing treatment which he met with at the hands of evil and unprincipled men. The reading literally is, Plead my cause, which is the same thing as to undertake a cause, or to take the charge of defending one in judgment, or to maintain the right of the oppressed. In the first place the Prophet in invoking God to defend his cause, shows that he is wrongfully oppressed, either by violence, calumnies, or crafty policies; and in seeking to be redeemed, he intimates that he was unable to make any resistance, or that he was so entangled in their snares, as to have no remaining hope except in the deliverance of God. In the second clause the letter l, lamed, seems to be taken for the letter k, caph, the mark of similitude, as would appear from his having used a little before (Psalm 119:149) a similar form of prayer. Again, as David here complains that he is held as it were in fetters by his enemies, unless he is delivered by the hand of his Redeemer, he with good reason beseeches God to restore him to life; for he who is rims abased is like a person dead. It is also aptly added according to thy word; for it is from the promises which God makes in his word of becoming our deliverer that the hope of life shines upon us. Whence the Prophet, when earnestly desiring to be brought from darkness to light, sustains and encourages himself by the word. If a different sense is preferred, then David is not to be understood as simply asking that life may be given him, but as praying for spiritual life, that he may be encouraged to exercise faith, to cultivate the fear of God, and to cherish the desire of living a holy life.

Plead my cause - Undertake my cause, as an advocate does. See the notes at Psalm 35:1.
Quicken me - Give me life. See the notes at Psalm 119:25.

Plead my cause - ריבה ריבי ribah ribi. "Be my Advocate in my suit." Contend for us against the Babylonians, and bring us out of our bondage.
According to thy word - Spoken by thy prophets for our comfort and encouragement.

Plead my cause, and deliver me: quicken me according to thy (a) word.
(a) For without God's promise there is no hope of deliverance.

Plead my cause, and deliver me,.... This shows that his affliction was chiefly from men, wicked, ungodly, and unreasonable men; such as were Saul and his courtiers, and a whole ungodly nation: his cause was a good one, and therefore he puts it into the hand of the Lord, and who otherwise would not have undertaken it; and this he did also because he could not plead it himself, nor any other for him but the Lord; his enemies that strove with him being so many, mighty, and crafty; see Psalm 35:1. Christ is the advocate of his people, their Redeemer, who is mighty, and thoroughly pleads their cause against the accusations of Satan, the charges of law and justice, and the condemnation of their own hearts; as well as defends their innocence from the calumnies of wicked men, and rights their wrongs, and redresses their grievances;
quicken me according to thy word; See Gill on Psalm 119:25.

Plead, &c.--HENGSTENBERG translates, "Fight my fight." (See Psalm 35:1; Psalm 43:1; Micah 7:9).