My soul hath fainted for thy salvation. The Psalmist intimates that, although worn out with continual grief, and perceiving no issue to his calamities, yet trouble and weariness had not produced such a discouraging effect upon his mind, as to prevent him from always reposing with confidence in God. To bring out the meaning the more distinctly, we must begin at the second clause, which is obviously added by way of exposition. There he affirms that he trusts in God; and this is the foundation of all. But, intending to express the invincible constancy of his trust, he tells us that he patiently endured all the distresses, under which others succumb. We see some embracing with great eagerness the promises of God; but their ardor, within a short time, vanishes; or, at least, is quenched by adversity. It was far otherwise with David. The verb klh, kalah, which signifies to faint, or to be consumed, seems, indeed, at first sight, to convey a different meaning. But the prophet, in this passage, as in other places, by fainting means that patience, which those who are deprived of all strength, and who seem to be already dead, continue to cherish, and which inspires their hearts with secret groanings, and such as cannot be uttered. This fainting, then, is opposed to the delicacy of those who cannot suffer a long delay.

My soul fainteth for thy salvation - The new division of the psalm, which begins here, is indicated by the Hebrew letter Kaph (כ k), equivalent to "k" or "c" (hard). The word here rendered "fainteth" is the same that in Psalm 73:26 is translated "faileth": "My flesh and my heart faileth." The idea is, that his strength gave way; he had such an intense desire for salvation that he became weak and powerless. Any strong emotion may thus prostrate us; and the love of God - the desire of his favor - the longing for heaven - may be so intense as to produce this result.
I hope in thy word - I trust in thy promises, and am sustained. My powers, which would otherwise wholly fail, are upheld by thy word, and on that I rely. See Psalm 119:74.

My soul fainteth for thy salvation - I have longed so incessantly after thy salvation - the complete purification and restoration of my soul, that my very spirits are exhausted.
"My heartstrings groan with deep complaint;My soul lies panting, Lord, for thee;
And every limb and every jointStretches for perfect purity."

CAPH. My soul (a) fainteth for thy salvation: [but] I hope in thy word.
(a) Though my strength fails me, yet my soul groans and sighs, resting still in your word.

CAPH.--The Eleventh Part.
CAPH. My soul fainteth for thy salvation, Either for temporal salvation and deliverance from enemies; which, being promised, was expected by him from the Lord; but not coming so soon as looked for, his spirits began to sink and faint: or for spiritual and eternal salvation, for a view of interest in it, for the joys and comforts of it, and for the full possession of is in heaven; and, particularly, for the promised Messiah, the author of it, often called the Salvation of God, because prepared and appointed by him to be the author of it: of him there was a promise, which gave the Old Testament saints reason to expect him, and for him they waited; his coming they earnestly wished for, but being long deferred, were sometimes out of heart, and ready to faint, which was here David's case;
but I hope in thy word; the word of promise concerning deliverance and salvation, especially by the Messiah, which supported him, and kept him from fainting; that being firm and sure, for ever settled in heaven, and has the oath of God annexed to it, for the confirmation of it; and God is faithful that has promised, and is also able to perform; so that his word lays a solid foundation for faith and hope.

The psalmist sought deliverance from his sins, his foes, and his fears. Hope deferred made him faint; his eyes failed by looking out for this expected salvation. But when the eyes fail, yet faith must not. His affliction was great. He was become like a leathern bottle, which, if hung up in the smoke, is dried and shrivelled up. We must ever be mindful of God's statutes. The days of the believer's mourning shall be ended; they are but for a moment, compared with eternal happiness. His enemies used craft as well as power for his ruin, in contempt of the law of God. The commandments of God are true and faithful guides in the path of peace and safety. We may best expect help from God when, like our Master, we do well and suffer for it. Wicked men may almost consume the believer upon earth, but he would sooner forsake all than forsake the word of the Lord. We should depend upon the grace of God for strength to do every good work. The surest token of God's good-will toward us, is his good work in us.

CAPH. (Psalm 119:81-88).
In sorrow the pious heart yearns for the comforts of God's promises (Psalm 73:26; Psalm 84:2).

The eightfold Kaph. This strengthening according to God's promise is his earnest desire (כּלה) now, when within a very little his enemies have compassed his ruin (כּלּה). His soul and eyes languish (כּלה as in Psalm 69:4; Psalm 84:3, cf. Job 19:27) for God's salvation, that it may be unto him according to God's word or promise, that this word may be fulfilled. In Psalm 119:83 כּי is hypothetical, as in Psalm 21:12 and frequently; here, as perhaps also in Psalm 27:10, in the sense of "although" (Ew. ֗362, b). He does not suffer anything to drive God's word out of his mind, although he is already become like a leathern bottle blackened and shrivelled up in the smoke. The custom of the ancients of placing jars with wine over the smoke in order to make the wine prematurely old, i.e., to mellow it (vid., Rosenm׬ller), does not yield anything towards the understanding of this passage: the skin-bottle that is not intended for present use is hung up on high; and the fact that it had to withstand the upward ascending smoke is intelligible, notwithstanding the absence of any mention of the chimney. The point of comparison, in which we agree for the most part with Hitzig, is the removal of him who in his dungeon is continually exposed to the drudgery of his persecutors. כּמּה in Psalm 119:84 is equivalent to "how few." Our life here below is short, so also is the period within which the divine righteousness can reveal itself. שׁיחות (instead of which the lxx erroneously reads שׂיחות), pits, is an old word, Psalm 57:7. The relative clause, Psalm 119:85, describes the "proud" as being a contradiction to the revealed law; for there was no necessity for saying that to dig a pit for others is not in accordance with this law. All God's commandments are an emanation of His faithfulness, and therefore too demand faithfulness; but it is just this faithfulness that makes the poet an object of deadly hatred. They have already almost destroyed him"in the land." It is generally rendered "on earth;" but "in heaven" at the beginning of the following octonary is too far removed to be an antithesis to it, nor does it sound like one (cf. on the other hand ἐν τοῖς ouranoi's, Matthew 5:12). It is therefore: in the land (cf. Psalm 58:3; Psalm 73:9), where they think they are the only ones who have any right there, they have almost destroyed him, without shaking the constancy of his faith. But he stands in need of fresh grace in order that he may not, however, at last succumb.

Fainteth - With long desire and earnest expectation.