Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 56
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 56, with English translation by Maimonides (Rambam).
לאכול בשר הפסח צלי בלילי חמישה עשר מניסן, שנאמר: "וְאָכְלוּ אֶת הַבָּשָׂר" (שמות יב, ח).
To eat the meat of the Paschal sacrifice roasted on the night of the fifteenth of Nisan, as [Exodus 12:8] states: "And they shall eat the meat...."