Halakhah su Deuteronomio 16:2

He prohibited us from leaving over any of the meat of the festival-offering that he sacrifices on the 14th (of Nissan) to the third day, but rather to eat it within two days. And that is His saying, "and none of the meat of what you slaughter on the evening of the first day shall remain overnight" (Deuteronomy 16:4) - as it is explained in the sixth [chapter] of Pesachim (Pesachim 71). And the received explanation (Sifra, Tzav, Chapter 12:7) comes [to teach], "'And none of the meat shall remain' - Scripture is speaking about the festival-offering that comes together with the Pesach-offering, that it is eaten for two days. I might [think], for one day. [But] when it says, 'until the morning,' it is to give a second morning." And about it did He say, "And you shall slaughter the Pesach-offering to the Lord" (Deuteronomy 16:2). And that which remains of it from the 14th to the third day shall be burnt - since it is [prohibited] by, do not leave over. [But it is rectified by a positive commandment,] so we do not give lashes for it. And the regulations of this commandment - meaning the festival offering specific to the fourteenth day [of Nissan] alone - have already been explained in [various places] in Chagigah and Pesachim. (See Parashat Re'eh; Mishneh Torah, Paschal Offering 10.)

To not leave over from the festive (chagigah) sacrifice to the third day: To not leave over anything from the festive sacrifice of the fourteenth day until the third day - and that is the sacrifice that comes with the Pesach [sacrifice] to increase the joy - but rather to eat it all within two days, which are are the fourteenth and fifteenth. And about this is it stated (Deuteronomy 16:4), "and none of the meat of what you slaughter on the evening of the first day shall be left to the morning." And the received (traditional) understanding came upon this (Pesachim 71a) that the verse is speaking about the festive [sacrifice] that comes with the Pesach, [to say] that the time of its eating is up to two days. And about this festive [sacrifice], Scripture stated (Deuteronomy 16:2), "And you shall slaughter the Pesach to the Lord, your God, flock and cattle" - meaning to say, that with the Pesach, he bring another sacrifice; meaning to increase the joy.