Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 123
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 123, with English translation by Maimonides (Rambam).
שלא להוציא מבשר הפסח מן החבורה, שנאמר "לא תוציא מן הבית" (שמות יב,מו).
Not to remove the meat of the Paschal sacrifice from the company [in which it is being eaten], as [Exodus 12:46] states: "Do not remove [any of the meat] from the house...."