(יח) שֹׁפְטִים וְשֹׁטְרִים תִּתֶּן לְךָ בְּכָל שְׁעָרֶיךָ אֲשֶׁר יקוק אֱלֹהֶיךָ נֹתֵן לְךָ לִשְׁבָטֶיךָ וְשָׁפְטוּ אֶת הָעָם מִשְׁפַּט צֶדֶק. (יט) לֹא תַטֶּה מִשְׁפָּט לֹא תַכִּיר פָּנִים וְלֹא תִקַּח שֹׁחַד כִּי הַשֹּׁחַד יְעַוֵּר עֵינֵי חֲכָמִים וִיסַלֵּף דִּבְרֵי צַדִּיקִם. (כ) צֶדֶק צֶדֶק תִּרְדֹּף לְמַעַן תִּחְיֶה וְיָרַשְׁתָּ אֶת הָאָרֶץ אֲשֶׁר יקוק אֱלֹהֶיךָ נֹתֵן לָךְ.
(18) You shall appoint magistrates and officials for your tribes, in all the settlements that the Lord your God is giving you, and they shall govern the people with due justice. (19) You shall not judge unfairly: you shall show no partiality; you shall not take bribes, for bribes blind the eyes of the discerning and upset the plea of the just. (20) Justice, justice shall you pursue, that you may thrive and occupy the land the the Lord your God is giving you.
(כה) כַּעֲבוֹר סוּפָה וְאֵין רָשָׁע וְצַדִּיק יְסוֹד עוֹלָם.
(25) When the storm passes the wicked person is gone, But the righteous person is the foundation of the world.
Noam Elimelekh, Parashat Bo
Elimelech Weisblum of Lizhensk
And the letter Tzadi hints at the practice of the Tzaddik.