יָ֭גוֹדּוּ עַל־נֶ֣פֶשׁ צַדִּ֑יק וְדָ֖ם נָקִ֣י יַרְשִֽׁיעוּ׃
They gather themselves together against the soul of the righteous, And condemn innocent blood.
Read halakhic rulings (Jewish law) on Psalms 94:21 from the Mishneh Torah and classical halakhic sources, free online.