Mishneh Torah, Leavened and Unleavened Bread 3

Sugya Map: The Mechanics of Bi'ur

• Core Issue: Is the mitzvah of destroying chametz a process of objective elimination or an exercise in removing personal domain?
• Primary Sources: Pesachim 6b, Pesachim 10b, Mishneh Torah, Hilchot Chametz U'Matzah 3:1-11.
• Nafka Mina: Whether one who neglects to destroy chametz before the deadline is absolved by bittul (nullification) or remains liable for the issur of possession.

Text Snapshot

Rambam states: "If he did not search at the time for destroying the chametz, he should search in the midst of the festival" (Mishneh Torah, Hilchot Chametz U'Matzah 3:7). Note the nuance: Rambam shifts from the earlier Sefer HaMitzvot (where he focused on the 14th) to a broader view where the mitzvah of destruction extends into the Chag itself.

Readings

• Ra'avad: Critiques the Rambam’s extension, arguing the mitzvah is time-bound to the 14th; searching during Chol HaMoed is, at most, a precautionary measure, not a fulfillment of the primary mitzvah.
• Ohr Sameach: Analyzes the derivation from notar (leftover sacrifices). He posits that because notar must be burned, chametz—linked to it via analogy—demands the same destructive methodology, shifting the focus from mere "disposal" to ritualized "obliteration."

Friction

Kushya: If the mitzvah is "destruction," why does Rambam permit simple nullification (bittul) in one's heart during an emergency (e.g., saving a life)? If bittul is sufficient, why perform a physical search at all? Terutz: Bittul addresses the issur of "possession" (bal yera'eh), but the physical mitzvah of bi'ur (destruction) remains the hechsher mitzvah. When one is occupied with a higher mitzvah (saving a life), the Torah grants a petur (exemption) from the physical act, reducing the obligation to the mental state of bittul.

Intertext

• Exodus 13:7: "No chametz shall be seen for you"—the basis for the issur of ownership.
• Shulchan Aruch, Orach Chayim 444:1: Codifies the necessity of bittul even after a successful search, mirroring the Talmudic concern that one might have missed "hidden places."

Psak/Practice

The Mishnah Berurah (446:2) emphasizes that on Yom Tov, when chametz is muktzeh, one must cover it rather than burn it, as burning increases no joy (simchat yom tov). The modern halacha remains: bittul is our safety net, but physical bi'ur is the primary fulfillment of the mitzvah.

Takeaway

Bi'ur is not just cleaning; it is the legal severance of property rights. If you cannot burn it, you must, at the very least, mentally disown it.