The Torah commands in Parashat Re’eh (Debarim 16:4), “Ve’lo Yalin Min Ha’basar Asher Tizbah Ba’ereb Ba’yom Ha’rishon La’boker” – forbidding leaving over meat from a sacrifice until morning. This verse refers to a specific sacrifice – the Hagiga offering that would be brought together with the Korban Pesach on the 14th of Nissan. The meat of the Hagiga offering is eaten that night, together with the meat of the Korban Pesach, and may be eaten also afterward, throughout the following day and the next night, until the morning of the 16th of Nissan. The Torah here forbids leaving over any of the meat of this sacrifice until the morning of the 16th of Nissan.
This sacrifice should not be confused with the standard Hagiga sacrifice which must be offered every Yom Tob. We deal here with a special sacrifice that would be offered together with the Korban Pesach on the afternoon of Ereb Pesach. The Sefer Ha’hinuch explains that this sacrifice is required because of the unique importance of the Korban Pesach. The Korban Pesach celebrates the miracle of Yesiat Misrayim, an event which confirms the fundamental belief that G-d created the world and exerts absolute control over it, and therefore, this sacrifice has special significance. As such, the Torah commanded eating the Korban Pesach as part of a festive event, and for this reason, an additional sacrifice is offered and eaten at the same time, in order to enhance the joy and festivity surrounding the Korban Pesach.
This sacrifice accompanying the Korban Pesach falls under the category of Shalmeh Simha – sacrifices offered for the sake of providing meat and thereby enhancing the festivity on Yom Tob. Therefore, this offering could be sacrificed even earlier, before the 14th of Nissan, as long as the meat can still be eaten at the Seder with the Korban Pesach. Moreover, if one had vowed to offer a Shelamim sacrifice, he may use that sacrifice as the Hagiga accompanying the Korban Pesach. This is in contrast to the standard Hagiga required every Yom Tob, which must stand alone and must be offered on the holiday.
This Misva, of course, applies only in the times of the Bet Ha’mikdash. The Sefer Ha’hinuch maintains that this requirement is binding even upon women, because women are included in the Yom Tob obligations. Others disagree, and contend that women are exempt from the obligation to offer the Hagiga on the 14th of Nissan.
Somebody who left over meat from this sacrifice until the morning of the 16th of Nissan has violated this prohibition, and is required to burn the leftover meat. The violator is not liable to Malkut, because he did not perform an action. Additionally, this violation can be corrected by burning the leftover meat, and no Malkut are incurred when violating a prohibition that can be corrected (“Lav Ha’nitak La’aseh”).