Let this be the work from Jehovah. That is, let the gain or reward of the work be from God. In pointing out the work as proceeding immediately from God, he intends to show that, though deprived of all human aid, he yet entertained the hope that God would grant him deliverance, and avenge the injuries of his servant. From this verse we learn that David did not rashly, or unadvisedly, utter curses against his enemies, but strictly adhered to what the Spirit dictated. I acknowledge, indeed, that not a few, while they pretend a similar confidence and hope, nevertheless, recklessly rush beyond the bounds of temperance and moderation. But that which David beheld by the unclouded eye of faith, he also uttered with a zeal becoming a sound mind; for having devoted himself to the cultivation of piety, and being protected by the hand of God, he was aware that the day was approaching when his enemies would meet with merited punishment. From which we also learn, that his trust was placed in God alone, and that he did not regard the persons of men so as to direct his course according as the world smiled or frowned upon him. And, assuredly, whosoever places his dependence on men, shall find that the most trifling incident will annoy him. Therefore, should the whole world abandon us, it becomes us, in imitation of this holy man, to lift up our heads to heaven, and thence look for our defender and deliverer. If it be his intention to employ human instrumentality for our deliverance, he will soon raise up those who will accomplish his purpose. Should he, for the trial of our faith, deprive us of all earthly assistance, instead of regarding that as any reflection upon the glory of his name, we ought to wait until the proper time arrive when he will fully display that decision in which we can calmly acquiesce.

Let this be the reward of mine adversaries from the Lord,... - The word rendered "reward" means usually work, labor, occupation, business; then, what one earns by his work - reward, recompence, Leviticus 19:13. The meaning here is, Let them constantly receive these things which I have prayed for Psalm 109:6-19; let them be constantly treated in this manner. This is a summing up of his entire wish - his whole desire. It cannot be proved that they did "not deserve" all this; it cannot be shown that if all this came upon them at the hand of God, it would be unjust; it cannot be denied that such things as these, either singly, in groups, or in succession, do actually come upon wicked people; and the prayer in the case "may" have been merely that justice might be done. Still, as before remarked, it is not easy wholly to vindicate the expressed feelings of the psalmist. See the notes at Psalm 109:10.

Let this be the reward of mine adversaries from the Lord, and of them that speak evil apainst my soul - Following the mode of interpretation already adopted, this may mean: All these maledictions shall be fulfilled on my enemies; they shall have them for their reward. So all the opposition made by the Jews against our Lord, and the obloquies and execrations wherewith they have loaded him and his religion, have fallen upon themselves; and they are awful examples of the wrath of God abiding on them that believe not.
But is not this verse a key to all that preceded it? The original, fairly interpreted, will lead us to a somewhat different meaning: זאת פעלת שטני מאת יהוה והדברים רע על נפשי zoth peullath soteney meeth Yehovah, vehaddoberim ra al naphshi. "This is the work of my adversaries before the Lord, and of those who speak evil against my soul," or life. That is, all that is said from the sixth to the twentieth verse consists of the evil words and imprecations of my enemies against my soul, laboring to set the Lord, by imprecations, against me, that their curses may take effect. This, which is a reasonable interpretation, frees the whole Psalm from every difficulty. Surely, the curses contained in it are more like those which proceed from the mouth of the wicked, than from one inspired by tne Spirit of the living God. Taking the words in this sense, which I am persuaded is the best, and which the original will well bear and several of the Versions countenance, then our translation may stand just as it is, only let the reader remember that at the sixth verse David begins to tell how his enemies cursed Him, while he prayed for Them.

[Let] this [be] the reward of mine adversaries (k) from the LORD, and of them that speak evil against my soul.
(k) For being destitute of man's help, he fully trusted in the Lord, that he would deliver him.

Let this be the reward of mine adversaries from the Lord,.... Who were so many Satans, as the word used signifies; and Judas particularly is called a devil; and of the same malevolent and diabolical disposition were the Jews in general, John 6:70 and what is before imprecated upon them is the just recompence of reward for their hatred to Christ and ill usage of him.
And of them that speak evil against my soul; or "life" (f); in order to take it away, as did the false witnesses that rose up against him, and the Jews who charged him with sedition and blasphemy.
(f) "contra vitam meam", Gejerus.

Let this . . . reward--or, "wages," pay for labor, the fruit of the enemy's wickedness.
from the Lord--as His judicial act.

That speak evil against my soul - With design to take away my life.