A temporary resident or a hired hand, he may not eat [the Passover offering] (Shemos 12:45).
It is a negative commandment to not feed any of the meat from the Pesach offering to a partial convert or temporary resident [who renounced idolatry], as is written, A temporary resident or a hired hand, he may not eat [the Passover offering] (Shemos 12:45). A “temporary resident” in this context is someone from among the nations who accepted upon himself to not worship foreign gods, but he [is not Jewish and therefore] eats non-slaughtered meat [i.e., non-kosher]. A “hired hand” is a [partial] convert who was circumcised but did not immerse in a mikvah.
Among the roots of this commandment is the same as what we wrote regarding other commandments that are remembrances of the Exodus from Egypt. And since this offering comes as a remembrance of the granting of our freedom and our entrance to a steadfast covenant with Hashem, may He be blessed, it is fitting that no one should partake of it except for those who have become complete in their faith — namely, full-fledged Israelites [including true converts]. But it does not extend to those people who have not entered the complete covenant with us, such as the “temporary resident” who did not accept all the commandments upon himself, or the “hired hand” who has not yet immersed in a mikvah.
This commandment applies when the Temple stands, to both men and women. One who transgresses it, and feeds [of the Pesach offering] to such people, violates this negative commandment.