Mishneh Torah, Forbidden Foods 1

Sugya Map

• Issue: The ontological and halachic status of "signs" (simanim) for kosher animals, beasts, fowl, and locusts. Is the "knowledge" of these signs a positive commandment (mitzvah) or a functional instrument to satisfy the prohibition of non-kosher consumption?
• Nafka Mina:
  1. If the knowledge is a mitzvah, is it absolute or contingent upon a desire to eat meat?
  2. Does the absence of these signs render an animal non-kosher by definition, or does it merely create a state of safek (doubt) requiring stringency?
• Primary Sources:
  • Leviticus 11:2, 11:47; Deuteronomy 14:7.
  • Mishneh Torah, Hilchot Ma’achalot Asurot 1:1–19.
  • Sifrei (Lev. 11:2); Chullin 59a–66b.

Text Snapshot

• Text: "מצות עשה לידע הסימנין שמבדילין בהן בין בהמה... שמותר לאכלן ובין שאין מותר לאכלן שנאמר והבדלתם..." (MT, Forbidden Foods 1:1).
• Nuance: Rambam uses the infinitive לידע (to know) as the ma'aseh mitzvah. The Maggid Mishneh notes the Sifrei links this to "This is the living creature that you may eat," creating a tension: is it a mandate to eat (impossible) or a mandate to master the taxonomy of permitted species? The Rambam’s choice of והבדלתם (And you shall distinguish) as the source text shifts the focus from the act of eating to the intellectual act of categorization.

Readings

The Ramban’s Critique

The Ramban (Hasagot to Sefer HaMitzvot, Principle 6) famously rejects the Rambam’s classification of "knowing the signs" as a distinct positive commandment. He argues that the Torah never commands one to eat meat; therefore, the "signs" are not a mitzvah but a prophylactic necessity (hechsher mitzvah) to ensure one does not violate the negative prohibition of eating tamei (impure) animals. For the Ramban, the mitzvah is the avoidance of the forbidden, not the cognitive mastery of the permitted.

The Rogatchover’s Logic (Tzafnat Pa’neach)

The Rogatchover Gaon offers a profound pivot. He suggests the mitzvah is not merely to prevent takalah (accidental transgression), but that the yedi'ah (knowledge) itself is the form of the mitzvah. He compares this to the laws of Nega’im (skin lesions) or Tum’ah, where the expertise of the scholar (yedi'ah) is a prerequisite for the judicial process. He posits that for animals, the signs are gezeirat hakathuv (divine decrees) that define the animal’s status, whereas for fowl, the signs are merely diagnostic markers. This creates a functional hierarchy: a beast with split hooves and cud-chewing is kosher because the Torah defined it as such; a bird with a gizzard is kosher only if we have a tradition that it is not a predator.

Friction

The Kushya: If "knowing the signs" is a positive commandment, why does the Shulchan Aruch and later Acharonim insist that we do not rely on signs for fowl, but only on an established masorah (tradition)? If the Torah commanded us to "know the signs," shouldn't that knowledge be sufficient to permit the bird?

The Terutz: The Tzafnat Pa’neach resolves this by distinguishing between essential signs and diagnostic signs. For cattle, the signs (hooves/cud) are the essence of the species' permissibility. For fowl, the signs (crop/extra claw) are merely heuristic—they are "indicators" that the bird is likely not a predator. Because they are only indicators, they cannot override the masorah—the historical record of the species' behavior. Thus, the mitzvah of "knowing" is satisfied by knowing that one must rely on masorah where the signs are not definitive. It is not an invitation to scientific empiricism, but a command to maintain the integrity of the Halachic taxonomy.

Intertext

• Parallel 1: Chullin 63b: The reliability of the "hunter." The Gemara establishes that a hunter’s word is accepted only if he possesses the masorah. This mirrors the Rambam’s requirement for yedi’ah—the "knowledge" is not theoretical biology, but the transmission of communal status.
• Parallel 2: Shulchan Aruch, Yoreh De’ah 79:1: The codification of the simanim. The SA adopts the Rambam’s signs but adds the Rama’s caveat: "One should not partake of any fowl unless there is a received tradition." This represents the meta-psak heuristic of the Acharonim: replacing the cognitive "knowledge" of signs with the sociological "knowledge" of masorah.

Psak/Practice

The practice today has largely moved away from reliance on individual anatomical analysis (signs) toward a reliance on communal masorah. The "positive commandment" of knowing the signs is fulfilled by the contemporary community's adherence to established lists of kosher species (e.g., the exclusion of turkey in some circles or the strict adherence to mesorah for specific birds). The psak is: knowledge of the signs does not grant an individual the autonomy to permit a species; it grants the individual the obligation to verify that the species aligns with the masorah of the community.

Takeaway

The mitzvah of "knowing the signs" is not a license for independent zoological inquiry, but an obligation to master the boundaries of the permitted. In the realm of kashrut, the Halachic sign is never a replacement for the Halachic tradition; it is its servant.