Midrash su Deuteronomio 16:6

"ben ha'arbayim": I might think that this means at morning twilight. It is, therefore, written (Devarim 16:6) "There shall you slaughter the Pesach in the evening." I might think that this is to be taken literally. It is, therefore, written (Ibid.) "at the time that you departed from Egypt." When was that? At midday, viz. (Exodus 12:41) "And it was in the middle of the day … that they left Egypt." R. Nathan says: Whence is it derived that "ben ha'arbayim" signifies midday? Even though there is no proof for this, it is intimated in (Jeremiah 6:4) "Prepare for battle against her. Arise and let us go up at noon (midday). Woe unto us for the day is declining, for the shadows of evening go forth!" R. Shimon b. Yochai says: The verse comes to apply the first (activity) to the last (time mentioned in the verse) and the last, to the first, viz.: "the time of your departing," to its slaughtering; "at sundown," to its roasting; "in the evening," to its eating. Ben Betheira says (Exodus 12:6) "ben ha'arbayim" [lit., "between the evenings"]: Slaughter it between the two evenings, (the "evening" of the day [i.e., after midday] and the "evening" preceding the night).

(Devarim 16:6) "But to the place that the L-rd your G-d chooses — there shall you sacrifice the Pesach offering in the evening, etc.": R. Eliezer says: Towards evening (of the fifteenth of Nissan) you sacrifice it. When the sun sets, you start eating it. At the time of your starting to leave Egypt, (i.e., at midnight) you burn (what is left of) it.