Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 273
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 273, with English translation by Maimonides (Rambam).
שלא לעוול המשפט, שנאמר "לֹא תַעֲשׂוּ עָוֶל בַּמִּשְׁפָּט" (ויקרא יט, טו).
Not to act deceitfully in judgment, as [Leviticus 19:15] states: "Do not pervert justice."