Do Not Have Leavening Agent in Your Home on Passover
Se’or — The Starter That Must Go
Exodus 12:19: “For seven days no leaven (se’or) is to be found in your houses.” Se’or is the fermentation starter — the active agent of leavening kept alive between bread-bakings. In a pre-industrial kitchen, the sourdough starter was a household’s ongoing possession: a living culture of wild yeast and bacteria that would be fed and maintained and used to leaven each new batch of dough. Commandment #473 requires this starter to be eliminated from the home along with all other forms of chametz. Not only the leavened product (chametz) but the leavening source (se’or) must be removed.
The logic is thoroughgoing: a household that retains its se’or over Passover has preserved the means of chametz production even if no actual chametz bread currently exists in the house. The Torah’s comprehensiveness here reflects its understanding of Passover as a complete break. The Exodus was not a partial departure — Israel did not carry Egypt’s bread-culture with them into the wilderness. The se’or, as the living source of Egypt’s bread, must go.
No Chametz in Any Dwelling — The Scope of the Home Prohibition
Exodus 12:20: “You shall eat nothing leavened; in all your dwelling places you shall eat unleavened bread.” The prohibition extends to “all your dwelling places” (moshvoteichem) — not just the primary residence but every place where the Israelite lives, stays, or maintains a household. This scope clause prevents a technical workaround: one cannot simply move chametz or se’or to a secondary location and claim the primary home is clean. The dwelling-place language covers the full extent of the Israelite’s residential domain.
In practical terms, the prohibition reaches vacation homes, offices where food is kept, vehicles where chametz might be stored, and any other location over which the Israelite exercises household control. The rabbis extended the search-and-elimination requirements accordingly: everywhere chametz or se’or might be found must be checked and cleared. The Passover domain is not just the kitchen — it is the full extent of the Israelite’s life and possessions.
Eliminating the Source vs. the Product — Why Se’or and Chametz Are Prohibited Separately
The Torah mentions se’or and chametz separately in multiple Passover passages. Exodus 12:15: “Seven days you shall eat unleavened bread; on the first day you shall remove leaven (se’or) from your houses.” The first-day removal command specifically names se’or, and the prohibition of eating chametz is addressed separately. By treating them as distinct, the Torah establishes two separate violation categories: possessing the source (se’or) and eating the product (chametz). Both must be absent; both absences are independently required.
This distinction also clarifies the bedikat chametz (pre-Passover search) requirement: the search is for any form of leaven in the home, including se’or that might have been missed. The sourdough culture that a baker maintains year-round must be disposed of before Passover — it cannot be set aside and resumed after the festival. The thoroughness of the se’or prohibition ensures that the Passover household is not merely chametz-free in its pantry but genuinely cleared of the leaven culture in all its forms.
Read the source passage in the Torah reader.
Read in the Torah Reader