Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 304
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 304, with English translation by Maimonides (Rambam).
שלא לנקום, שנאמר "לא תיקום" (ויקרא יט,יח).
Not to take revenge, as [Leviticus 19:18] states: "Do not take revenge."