Here we have the psalmist,
I. Longing for help from heaven: My soul faints; my eyes fail. He longs for the salvation of the Lord and for his word, that is, salvation according to the word. He is not thus eager for the creatures of fancy, but for the objects of faith, salvation from the present calamities under which he was groaning and the doubts and fears which he was oppressed with. It may be understood of the coming of the Messiah, and so he speaks in the name of the Old Testament church; the souls of the faithful even fainted to see that salvation of which the prophets testified. (Pe1 1:10); their eyes failed for it. Abraham saw it at a distance, and so did others, but at such a distance that it put their eyes to the stretch and they could not stedfastly see it. David was now under prevailing dejections, and, having been long so, his eyes cried our, "When wilt thou comfort me? Comfort me with thy salvation, comfort me with thy word." Observe, 1. The salvation and consolation of God's people are secured to them by the word, which will certainly be fulfilled in its season. 2. The promised salvation and comfort may be, and often are, long deferred, so that they are ready to faint and fall in the expectation of them. 3. Though we think the time long ere the promised salvation and comfort come, yet we must still keep our eye upon that salvation, and resolve to take up with nothing short of it. "Thy salvation, thy word, thy comfort, are what my heart is still upon."
II. Waiting for that help, assured that it will come, and tarrying till it come: But I hope in thy word; and but for hope the heart would break. When the eyes fail yet the faith must not; for the vision is for an appointed time, and at the end it shall speak and shall not lie.

The proud have digged pits for me,.... Laid snares and temptations in his way, to draw him into sin, and so into mischief; they sought indeed to take away his life, and formed schemes for it. The allusion is to the digging of pits for the taking of wild beasts; which shows the ill opinion they had of David, and their ill usage of him; see Psa 7:15;

which are not after thy law; no, contrary to it; which forbids the digging of a pit, and leaving it uncovered, so that a neighbour's beast might fall into it, Exo 21:33; and if those might not be dug to the injury of beasts, then much less to the injury of men, to the hurt of the servants of the Lord, or to the shedding of innocent blood, which the law forbids.