Adam Clarke on Psalms 109:7

Let him be condemned - יצא רשע yetse rasha. "Let him come out a wicked man;" that is let his wickedness be made manifest.

Let his prayer become sin - Thus paraphrased by Calmet: "Let him be accused, convicted, and condemned, and let the defense which he brings for his justification only serve to deepen his guilt, and hasten his condemnation." I once more apprise the reader, that if these are not the words of David's enemies against himself, (see on Psa 109:20 (note)), they are prophetic denunciations against a rebellious and apostate person or people, hardened in crime, and refusing to return to God.