Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 301
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 301, with English translation by Maimonides (Rambam).
שלא לרגל, שנאמר "לא תלך רכיל בעמיך" (ויקרא יט,טז).
Not to gossip, as [Leviticus 19:16] states: "Do not go around as a gossiper among your people."