Negative commandment · Lo Ta’aseh #127 of 613
Not to feed the meat of the Paschal sacrifice to an uncircumcised male
שלא יאכל הערל בשר הפסח
The verse · Shemot 12:48
וְכִי־יָגוּר אִתְּךָ גֵּר וְעָשָׂה פֶסַח לַה׳ הִמּוֹל לוֹ כׇל־זָכָר וְאָז יִקְרַב לַעֲשֹׂתוֹ וְהָיָה כְּאֶזְרַח הָאָרֶץ וְכׇל־עָרֵל לֹא־יֹאכַל בּוֹ
“And when a stranger shall sojourn with thee, and will keep the passover to the Lord, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat of it.”
The Rambam’s words
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."
שלא יאכל הערל בשר הפסח, שנאמר "כל ערל, לא יאכל בו" (שמות יב,מח).
Why · Sefer HaChinuch #17
That an uncircumcised man not eat from the Pesach sacrifice
“From the roots of this commandment are that which we have written about a resident and a wageworker.”
Who & when
“And [it] is practiced at the time of the [Temple].”
Where in the Mishneh Torah
Hilchot Paschal Offering הלכות קרבן פסח