Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 127
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 127, with English translation by Maimonides (Rambam).
שלא יאכל הערל בשר הפסח, שנאמר "כל ערל, לא יאכל בו" (שמות יב,מח).
Not to feed the meat of the Paschal sacrifice to an uncircumcised male, as [Exodus 12:48] states: "No uncircumcised person may eat of it."