Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 315
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 315, with English translation by Maimonides (Rambam).
שלא לקלל הדיין, שנאמר "אלוהים, לא תקלל" (שמות כב,כז).
Not to curse a judge, as [Exodus 22:27] states: "Do not curse judges."