| Barnes' Notes on the Bible His cursing - Another reading has "my curse," i. e., the curse that has fallen upon me. David recognizes in every word and action that he was receiving the due reward of his sin, and that which Nathan had foretold.
Gill's Exposition of the Entire BibleIt may be that the Lord will look on mine affliction,.... Through the rebellion of his son, and now aggravated by the cursing of Shimei; that is, with an eye of pity and commiseration, and deliver him out of it: or "look upon my eye" (x); for there is a various reading; the tear of mine eye, as the Targum; so Jarchi and R. Isaiah; the tears in it, which fell plentifully from it, on account of his troubles, and particularly the curses and reproaches of Shimei: and that the Lord will requite me good for his cursing this day; he does not speak with assurance, yet with hope; he knew his sins deserved such treatment, but also that God was gracious and merciful, and pitied his children, and resented all ill usage of them; and therefore hoped he would favour him with such intimations of his love as would support him, comfort, refresh him, and do him good, see Romans 8:28. (x) "in oculum meum", Montanus; "oculum meum lachrymantem", Munster.
Geneva Study BibleIt may be that the LORD will look on mine affliction, and that the LORD will {g} requite me good for his cursing this day. (g) Meaning, that the Lord will send comfort to his, when they are oppressed.
King James Translators' Notesaffliction: or, tears: Heb. eye
Matthew Henry's Concise Commentary16:5-14 David bore Shimei's curses much better than Ziba's flatteries; by these he was brought to pass a wrong judgment on another, by those to pass a right judgment on himself: the world's smiles are more dangerous than its frowns. Once and again David spared Saul's life, while Saul sought his. But innocence is no defence against malice and falsehood; nor are we to think it strange, if we are charged with that which we have been most careful to keep ourselves from. It is well for us, that men are not to be our judges, but He whose judgment is according to truth. See how patient David was under this abuse. Let this remind us of Christ, who prayed for those who reviled and crucified him. A humble spirit will turn reproaches into reproofs, and get good from them, instead of being provoked by them. David the hand of God in it, and comforts himself that God would bring good out of his affliction. We may depend upon God to repay, not only our services, but our sufferings. | 
