John Gills Exposition of the Bible Commentary - Psalms 37:1
Fret not thyself because of evildoers ,.... The saints may be grieved at them and for them, because of their evil doings, and may be angry with them for them; yet are not to show any undue warmth, at least in an indecent way, by calling them opprobrious names; for the words may be rendered, "do not show thyself warm" or "angry" F9 תתחר "ne accendaris ira", Junius & Tremellius; "ne exardescas", Gejerus, Michaelis. : in a sinful way; or fret not at their outward prosperity, as it... read more
Matthew Henry's Complete Commentary - Psalms 37:1-6
The instructions here given are very plain; much need not be said for the exposition of them, but there is a great deal to be done for the reducing of them to practice, and there they will look best. I. We are here cautioned against discontent at the prosperity and success of evil-doers (Ps. 37:1, 2): Fret not thyself, neither be thou envious. We may suppose that David speaks this to himself first, and preaches it to his own heart (in his communing with that upon his bed), for the suppressing... read more