Positive commandment · Mitzvat Aseh #55 of 613
To slaughter the Paschal lamb
לשחוט כבש הפסח
The verse · Shemot 12:6
וְהָיָה לָכֶם לְמִשְׁמֶרֶת עַד אַרְבָּעָה עָשָׂר יוֹם לַחֹדֶשׁ הַזֶּה וְשָׁחֲטוּ אֹתוֹ כֹּל קְהַל עֲדַת־יִשְׂרָאֵל בֵּין הָעַרְבָּיִם
“and you shall keep it until the fourteenth day of the same month: and the whole assembly of the congregation of Yisra᾽el shall kill it towards evening.”
The Rambam’s words
To slaughter the Paschal lamb, as [Exodus 12:6] states: "And the entire congregation shall slaughter it...."
לשחוט כבש הפסח, שנאמר: "וְשָׁחֲטוּ אֹתוֹ כָּל קְהַל " (שמות יב, ו).
Why · Sefer HaChinuch #5
Slaughter the Pesach sacrifice
“From the roots of this commandment are so that the Jews will remember forever the great miracles that G-d performed for them during the exodus from Egypt.”
Who & when
“And [it] is practiced by males and by females at the time of the [Temple].”
Where in the Mishneh Torah
Hilchot Paschal Offering הלכות קרבן פסח