Pesach in Egypt ⇄ Pesach in Jerusalem
Exodus instructs each family in Egypt to slaughter a paschal lamb and eat it at home, while Deuteronomy commands a community ritual, to take place at the central worship location, i.e., the Jerusalem Temple. These two conceptions cross-pollinate, first in the Torah and then in its early reception: Jubilees requires everyone to eat in the Temple as their home; the Mishnah requires everyone to slaughter together in three cohorts; most surprisingly, R. Eliezer claims that, in theory, all of Israel can share one paschal animal.
