Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 126
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 126, with English translation by Maimonides (Rambam).
שלא להאכיל בשר הפסח לגר תושב, שנאמר "תושב ושכיר, לא יאכל בו" (שמות יב,מה).
Not to feed the meat of the Paschal sacrifice to a resident alien, as [Exodus 12:45] states: "No temporary resident or hired worker may eat from it."