Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 278
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 278, with English translation by Maimonides (Rambam).
שלא להטות משפט אדם חוטא, שנאמר "לֹא תַטֶּה מִשְׁפַּט אֶבְיֹנְךָ" (שמות כג, ו); למדו מפי השמועה, שזה אביון במצוות.
Not to pervert judgment against a sinner, as [implied by Exodus 23:6, which] states: "Do not pervert the judgment of a poor person." This refers to someone who is poor with regard to [the observance of] the mitzvot.