Psalm 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: in a sinful way; or fret not at their outward prosperity, as it is explained ( Psalms 37:7 ) . The Targum adds, "to be like them", which agrees with ( Psalms 37:8 ) ;

neither be thou envious against the workers of iniquity;
that is, at their present temporal happiness; see ( Psalms 73:3 ) . The Targum adds, as before, to be joined with them; which sense some parallel places seem to incline to, ( Proverbs 3:31 ) ( 23:17 ) .