Plead my cause, O Jehovah! As the enemies of David not only avowedly sought to take away his life, but also troubled him by calumny and misrepresentation, he pleads for the redress of both these grievances. In the first place, by appealing to God for his aid in defense of his cause, he intimates, that he has to do with wicked and maligning men. In the second place, by urging him to take up arms, he shows that he was grievously oppressed. It was a very dishonorable thing, that this holy man, alike eminent for his beneficence and inoffensiveness towards all men, and who by his courtesy and meekness had merited, both in public and private, the esteem and favor of all, was not permitted to escape the reproach and calumny of wicked men; but it is important for us to know this, and it sets before us a very profitable example. If even David did not escape the malice of wicked men, it ought not to seem wonderful or strange to us, if they blame and bite at us. The injuries they inflict upon us may be grievous and painful, but there is incomparable consolation presented to us in this consideration, that God himself interposes for our protection and defense against false accusations. Though calumniators, then, should arise, and tear us, as it were, to pieces, by falsely charging us with crimes, we need not be disturbed, so long as God undertakes to plead our cause against them. There can be no doubt, that in the second clause of the verse David implores God to resist the armed violence of his enemies. The amount of the whole is, that being falsely accused and cruelly persecuted, and finding no help at the hands of men, the Prophet commits the preservation of his life and his reputation to God.

Plead my cause, O Lord - The word "plead" means, properly, to argue in support of a claim, or against the claim of another; to urge reasons for or against; to attempt to persuade one by argument or supplication; as, to plead for the life of a criminal, that is, to urge reasons why he should be acquitted or pardoned; and then, to supplicate with earnestness in any way. The original word used here - רוב rûb - means to contend, strive, quarrel; and then, to contend before a judge, to manage or plead a cause. The idea here is, that the psalmist desires that God would undertake his cause against those who had risen up against him, as if it were managed before a tribunal, or before a judge, and God should be the advocate. The same word is used, in another form, in the other member of the sentence - "with them that strive - יריבי yârı̂ybāy - against me." The idea is, that they were "pleading" against him, or were urging arguments, as it were, before a tribunal or a judge, why he should be condemned. They were his bitter opponents, engaged in bringing all manner of false accusations against him, and seeking his condemnation. The psalmist felt that he could not manage his own cause against them; and he, therefore, pleads with God that He would interpose, and stand up for him.
Fight against them that fight against me - The same idea substantially occurs here as in the former member of the verse. It is a prayer that God would undertake his cause; that He would exert His power against those who were opposed to him.

Plead my cause, O Lord - Literally, Contend, Lord, with then that contend with me. The word is often used in a forensic or law sense.

"[A Psalm] of David." Plead [my (a) cause], O LORD, with them that strive with me: fight against them that fight against me.
(a) He desires God to undertake his cause against them who persecute him and slander him.

Plead my cause, O Lord, with them that strive with me,.... Meaning Saul and his courtiers; concerning whom he elsewhere desires that the Lord would judge between them, plead his cause, and deliver him; as he accordingly did, and maintained it, and the righteousness of it, 1-Samuel 24:12. So Christ pleaded not his own cause as man, but committed himself to him that judgeth righteously; and his people leave their cause with him, who is their advocate, and is able to plead it thoroughly; and does plead it against wicked and ungodly men, who unrighteously charge them; against. Satan the accuser of the brethren, who stands at their right hand to resist them; and against their own hearts, and the sins of them, which lust and war against them, and condemn them;
fight against them that fight against me: so the Lord is sometimes represented as a man of war, and Christ as a warrior fighting for the saints; and safe are they on whose side he is; but miserable all such who are found fighters against him and his; for none ever opposed him and prospered.

It is no new thing for the most righteous men, and the most righteous cause, to meet with enemies. This is a fruit of the old enmity in the seed of the serpent against the Seed of the woman. David in his afflictions, Christ in his sufferings, the church under persecution, and the Christian in the hour temptation, all beseech the Almighty to appear in their behalf, and to vindicate their cause. We are apt to justify uneasiness at the injuries men do us, by our never having given them cause to use us so ill; but this should make us easy, for then we may the more expect that God will plead our cause. David prayed to God to manifest himself in his trial. Let me have inward comfort under all outward troubles, to support my soul. If God, by his Spirit, witness to our spirits that he is our salvation, we need desire no more to make us happy. If God is our Friend, no matter who is our enemy. By the Spirit of prophecy, David foretells the just judgments of God that would come upon his enemies for their great wickedness. These are predictions, they look forward, and show the doom of the enemies of Christ and his kingdom. We must not desire or pray for the ruin of any enemies, except our lusts and the evil spirits that would compass our destruction. A traveller benighted in a bad road, is an expressive emblem of a sinner walking in the slippery and dangerous ways of temptation. But David having committed his cause to God, did not doubt of his own deliverance. The bones are the strongest parts of the body. The psalmist here proposes to serve and glorify God with all his strength. If such language may be applied to outward salvation, how much more will it apply to heavenly things in Christ Jesus!

The Psalmist invokes God's aid, contrasting the hypocrisy, cunning, and malice of his enemies with his integrity and generosity. The imprecations of the first part including a brief notice of their conduct, the fuller exposition of their hypocrisy and malice in the second, and the earnest prayer for deliverance from their scornful triumph in the last, are each closed (Psalm 35:9-10, Psalm 35:18, Psalm 35:27-28) with promises of praise for the desired relief, in which his friends will unite. The historical occasion is probably 1Sa. 24:1-22. (Psalm. 35:1-28)
God is invoked in the character of a warrior (Exodus 15:3; Deuteronomy 32:41).

The psalmist begins in a martial and anthropomorphical style such as we have not hitherto met with. On the ultima-accentuation of ריבה, vid., on Psalm 3:8. Both את are signs of the accusative. This is a more natural rendering here, where the psalmist implores God to subjugate his foes, than to regard את as equivalent to עם (cf. Isaiah 49:25 with ib. Psalm 27:8; Job 10:2); and, moreover, for the very same reason the expression in this instance is לחם, (in the Kal, which otherwise only lends the part. לחם, Psalm 56:2., to the Niph. נלחם) instead of the reciprocal form הלּחם. It is usually supposed that לחם means properly vorare, and war is consequently conceived of as a devouring of men; but the Arabic offers another primary meaning: to press close and compact (Niph. to one another), consequently מלחמה means a dense crowd, a dense bustle and tumult (cf. the Homeric κλόνος). The summons to Jahve to arm, and that in a twofold manner, viz., with the מגן for warding off the hostile blow and צנּה (vid., Ps 5:13) which covers the body like a testudo - by which, inasmuch as it is impossible to hold both shields at the same time, the figure is idealised - is meant to express, that He is to make Himself felt by the foes, in every possible way, to their own confounding, as the unapproachable One. The ב of בּעזרתי (in the character of help turned towards me) is the so-called Beth essentiae,
(Note: The Hebrew Beth essentiae is used much more freely and extensively than the Arabic, which is joined exclusively to the predicate of a simple clause, where in our language the verb is "to be," and as a rule only to the predicate of negative clauses: laisa bi-hakı̂mim, he is not wise, or laisa bi-l-hakı̂mi, he is not the wise man. The predicate can accordingly be indeterminate or determinate. Moreover, in Hebrew, where this ב is found with the predicate, with the complement of the subject, or even, though only as a solecism (vid., Gesenius' Thesaurus p. 175), with the subject itself, the word to which it is prefixed may be determinate, whether as an attribute determined by itself (Exodus 6:3, בּאל שׁדּי), by a suffix (as above, Psalm 35:2, cf. Psalm 146:5; Exodus 18:4; Proverbs 3:26), or even by the article. At all events no syntactic objection can be brought against the interpretations of בעשׁן, "in the quality of smoke," Psalm 37:20; cf. בּהבל, Psalm 78:33, and of בּנּפשׁ, "in the character of the soul," Leviticus 17:11.)
as in Exodus 18:4; Proverbs 3:26; Isaiah 48:10 (tanquam argentum), and frequently. הריק has the same meaning as in Exodus 15:9, cf. Genesis 14:14, viz., to bring forth, draw forth, to draw or unsheath (a sword); for as a sword is sheathed when not in use, so a spear is kept in the δουροδόκη (Odyss. i. 128). Even Parchon understands סגר to mean a weapon; and the word σάγαρις, in Herodotus, Xenophon, and Strabo, a northern Asiatic, more especially a Scythian, battle-axe, has been compared here;
(Note: Probably one and the same word with the Armenian sakr, to which are assigned the (Italian) meanings mannaja, scure, brando ferro, in Ciakciak's Armenian Lexicon; cf. Lagarde's Gesammelte Abhandlungen, 1866, S. 203.)
but the battle-axe was not a Hebrew weapon, and סגר, which, thus defectively written, has the look of an imperative, also gives the best sense when so taken (lxx σύγκλεισον, Targ. וּטרוק), viz., close, i.e., cut off, interclude scil. viam. The word has Dech, because לקראת רדפי, "casting Thyself against my persecutors," belongs to both the preceding summonses. Dachselt rightly directs attention to the similar sequence of the accents in Psalm 55:19; Psalm 66:15. The Mosaic figure of Jahve as a man of war (אישׁ מלחמה, Exodus 15:3; Deuteronomy 32:41.) is worked out here with brilliant colours, under the impulse of a wrathful spirit. But we see from Psalm 35:3 what a spiritual meaning, nevertheless, the whole description is intended to convey. In God's intervention, thus manifested in facts, he would gladly hear His consolatory utterance to himself. The burden of his cry is that God's love may break through the present outward appearance of wrath and make itself felt by him.