לְדָוִ֨ד ׀ אַל־תִּתְחַ֥ר בַּמְּרֵעִ֑ים אַל־תְּ֝קַנֵּ֗א בְּעֹשֵׂ֥י עַוְלָֽה׃
[A Psalm] of David. Fret not thyself because of evil-doers, neither be thou envious against them that work unrighteousness.
Read halakhic rulings (Jewish law) on Psalms 37:1: and classical halakhic sources.