Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 55
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 55, with English translation by Maimonides (Rambam).
לשחוט כבש הפסח, שנאמר: "וְשָׁחֲטוּ אֹתוֹ כָּל קְהַל " (שמות יב, ו).
To slaughter the Paschal lamb, as [Exodus 12:6] states: "And the entire congregation shall slaughter it...."