And the 55th mitzvah is that we are commanded to sacrifice a lamb for Pesach on the 14th day of the month of Nissan.

The source of this commandment is G‑d's statement1 (exalted be He), "The entire community of Israel shall then slaughter it in the afternoon" [immediately preceding Pesach].

Anyone, man or woman, who transgresses this commandment by intentionally not bringing the offering in the proper time is punished by kares. It has been explained in tractate Pesachim2 that women are equally obligated as men to bring a Pesach offering, and that it overrides Shabbos, i.e., it is offered even when the 14th of Nissan falls on Shabbos.

Scripture states that the punishment is kares in G‑d's state­ment,3 "If a man is pure and was not on a distant journey, and he neglects to bring the Pesach offering, that person shall be cut off [spiritually]." In the beginning of tractate Kerisus,4 when listing the commandments punishable by kares — all of which are prohibi­tions — it lists, "And Pesach and circumcision, which are positive commandments." We have already explained this in the Introduc­tion.5

The details of this mitzvah are explained in tractate Pesachim.