Comentario sobre Deuteronómio 16:6

בערב כבוא השמש מועד צאתך ממצרים [THERE THOU SHALT SACRIFICE THE PASSOVER] AT EVEN, AT THE GOING DOWN OF THE SUN, AT THE APPOINTED TIME THAT THOU CAME FORTH OUT OF EGYPT — But these are three different points of time! The explanation is: at evening, i.e. from the sixth hour (reckoning from six o’clock in the morning) and onwards you shall slaughter it (תזבח בערב); and when the sun goes down you shall eat it, and at the time when you left Egypt (in the early morning) you shall burn it — that is to say, if in the morning there is any flesh left, it becomes what is technically termed נותר and must be removed to the “place of burning” (not actually burnt, for this is not permissible on a festival) (Sifrei Devarim 133:1; cf. Berakhot 9a).

בערב, כבוא השמש מועד, “in the evening, as the sun sets, the appointed time;” the Torah here mentions three separate times:
1) “in the evening;” the Passover is to be slaughtered beginning with a period which can be termed “evening,” i.e. after noon.
2) “when the sun sets,” this is the time when you may eat it.
3) “at the time you left Egypt (dawn);” at this point any leftovers have to be burned (Berachot 9).

These are three separate times, etc. It is as if the verse had written, “There you will slaughter the pesach in the evening — which is after six hours, and eat it at sunset — which is night time, and burn it at the time you left Egypt.” But since it is not an obligation to burn it, therefore Rashi says, “Meaning that it is disqualified as nosar and must be removed to the burning site.”