Mishneh Torah, Leavened and Unleavened Bread 2-4

Sugya Map

• Issue: The nature and timing of the Mitzvat Aseh to destroy chametz (Tashbitu).
• Primary Source: Exodus 12:15 ("On the first day, destroy leaven...") read in light of Exodus 34:25 ("Do not slaughter the blood of My sacrifice with chametz").
• Nafka Mina:
  • Does the obligation to destroy chametz arise only when the prohibition (issur) begins (the 6th hour), or does it exist independently throughout the 14th of Nisan?
  • What constitutes "destruction"? (Mental nullification vs. physical removal).
  • How do we reconcile the redundancy of the biblical verses?

Text Snapshot

• Text: "מצות עשה מן התורה להשבית החמץ קודם זמן איסור אכילתו שנאמר ביום הראשון תשביתו וכו'" (MT, Hilchot Chametz U'Matzah 2:1).
• Leshon Nuance: The Rambam frames the mitzvah as lehashbit (to cause to cease). He distinguishes between the Torah requirement (nullification in the heart/resolve) and the Rabbinic requirement (physical search/removal). The use of "מפי השמועה" (by oral tradition) suggests that the interpretation of "the first day" as the 14th is a fixed Halacha LeMoshe MiSinai rather than a derivative midrashic exercise.

Readings

The Chiddush of the Kessef Mishneh

The Kessef Mishneh (Joseph Karo) struggles with the Rambam’s structure. Why cite "Oral Tradition" if the verse in Exodus 34:25 provides a logical proof? He posits that the verse regarding the Pesach slaughter is not merely a proof but a boundary setter. Without it, we might have misinterpreted the mitzvah of "destruction" as occurring at any time. The Kessef Mishneh suggests the verse teaches us the when: the 14th of Nisan, specifically at the time of the Pesach slaughter (midday).

The Chiddush of the Sefer HaMenucha

The Sefer HaMenucha emphasizes the "non-action" nature of the Torah obligation. He argues that because Bitul (nullification) is a mental act—lacking any physical ma'aseh—it is exempt from a beracha. The mitzvah is not to "clean" in the modern sense, but to "relinquish ownership." The Rabbinic search is a hecher (clarification) of the mental state. If the heart does not agree, the speech is void. This aligns with his view that Bitul is legally sufficient for property that cannot be reached (e.g., collapsed buildings), whereas the Rabbinic search is required for accessible property to prevent negligence.

Friction

The Kushya

The Tzafnat Paneach (Rogatchover Gaon) and others note a deep structural tension: If the Torah command is to destroy chametz (a positive mitzvah), why does the Rambam equate it with Bitul (a mental state)? Furthermore, if Bitul is the mitzvah, why does the Rambam then require a physical search? If Bitul works, the chametz is legally "dust." Why search for dust?

The Terutz

The Rambam views the mitzvah of Tashbitu as a two-tiered obligation.

1. Torah level: The mitzvah is to render the chametz ownerless (hefker) so that it is no longer "yours" (lo yera'eh lecha). This is accomplished by the heart.
2. Rabbinic level: Because the Rabbis feared the mental state would be incomplete or forgotten, they instituted a physical search to ensure the Torah intent is actually realized. The "friction" is resolved by understanding that the search is not the mitzvah of Tashbitu itself, but the guarantor of the Tashbitu. Thus, if a person is in a situation where they truly cannot search (e.g., a collapse), the Torah mitzvah of Bitul remains valid, while the Rabbinic stringency is waived.

Intertext

• Pesachim 4b: The Gemara debates the verse "On the first day, destroy leaven." The Tosefot (s.v. Ach) notes that the redundancy of the verses is necessary to establish the mitzvah of Tashbitu as an independent command, not just a corollary to the issur.
• Shulchan Aruch, Orach Chayim 431: The SA codifies the Rambam’s view that the search must be done at night because "all people are at home." This underscores the Rabbinic priority of effectiveness—the mitzvah must be performed in a way that minimizes the chance of error.

Psak/Practice

The Rambam teaches us a meta-halachic heuristic: Intent defines the legal status of the object. If a person nullifies the chametz in their heart, it ceases to be "theirs" in the eyes of the Torah. However, Psak follows the Rishonim (Ashkenazic tradition) who hold that we rely on Bitul only as a backup. Practically, we perform a physical bedikah with a candle, followed by Bitul, and finally a Biur (destruction) on the morning of the 14th. The Rambam reminds us that should a crisis arise (e.g., travel or emergency), the Bitul is the anchor of the mitzvah; never neglect the heart, even if the hands are tied.

Takeaway

The mitzvah is to "cause the chametz to cease"—the search is merely the evidence of a heart that has already decided it possesses nothing of value.