For the source text click/tap here: Zevachim 57
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The Mishna had stated: The pesach offering is only eaten at night etc. The Gemora asks: Who is the author of this Mishna? Rav Yosef answers: This must be Rabbi Elozar ben Azaryah.
This is as the braisa states: Rabbi Elozar ben Azaryah says that the verse states, on this night (regarding pesach) and I will pass through the land of Egypt on this night (regarding makkas bechoros). Just as makkas bechoros was until (i.e. at, and not after) midnight, so too the pesach offering can only be eaten at midnight.
We explore the hermeneutics of “that night” as well as chassidic and Jungian archetypes.