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Matthew Henry's Commentary – Verse 139
Verse 139

Here is, 1. The great contempt which wicked men put upon religion: My enemies have forgotten thy words. They have often heard them, but so little did they heed them that they soon forgot them, they willingly forgot them, not only through carelessness let them slip out of their minds, but contrived how to cast them behind their backs. This is at the bottom of all the wickedness of the wicked, and particularly of their malignity and enmity to the people of God; they have forgotten the words of God, else those would give check to their sinful courses. 2. The great concern which godly men show for religion. David reckoned those his enemies who forgot the words of God because they were enemies to religion, which he had entered into a league with, offensive and defensive. And therefore his zeal even consumed him, when he observed their impieties. He conceived such an indignation at their wickedness as preyed upon his spirits, even ate them up (as Christ’s zeal, John 2:17), swallowed up all inferior considerations, and made him forget himself. My zeal has pressed or constrained me (so Dr. Hammond reads it), Acts 18:5. Zeal against sin should constrain us to do what we can against it in our places, at least to do so much the more in religion ourselves. The worse others are the better we should be.