As a historical commemoration, Passover is tied to a specific date. Nevertheless, the Torah gives a make-up date for bringing the offering a month later. Gerim, non-Israelites living among Israelites as equals, are also allowed to bring this offering, even though it wasn’t their ancestors who were freed. How do we make sense of these anomalies?
Upon purifying the Temple in his first year as king, Hezekiah delays the celebration of Passover until the 14th of Iyar, the date of the Torah’s Pesach Sheni, “Second Passover.” A close examination of the story (2 Chr 29–30) demonstrates that this wasn’t a simple application of the Pesach Sheni law, but that Hezekiah was innovating in order to create unity between the northern Israelites and southern Judahites.