Menachot 54

Sugya Map

• Issue: Does an item's halachic shiur (measure) derive from its current volume (k'mot she'hein) or its original volume (k'mot she'hayu)? This impacts tumah and terumot validity.
• Nafka Mina(s): Susceptibility of food to tumah after swelling/shrinking, validity of teruma/tithes separated from different states of produce, and the chumra of the minchat choteh (sinner's meal offering).
• Primary Sources: Menachot 54a-b; Mishna Okatzin 2:8; Tosefta Terumot 4:2; Mishna Teharot 3:6.

Text Snapshot

The Gemara cites a baraita concerning an item that swelled to the requisite measure for tumah: "בשר עגל שתפח... טהור מן העבר וטמא מכאן ולהבא."¹ This implies the current state is determinative for future tumah. When challenged by the opinion that shiurim follow the initial state, the Gemara initially answers: "מדרבנן."²
_{1. Menachot 54a:10. 2. Menachot 54a:10.}

Readings

Rashi

Rashi unpacks the Gemara's ensuing kushya: If the baraita's rule for the calf meat is merely m'drabanan, how can it equate this to piggul and notar? The karet punishment for piggul and notar is d'oraita, not d'rabannan, implying their shiur must also be d'oraita.³

Rabbeinu Gershom

Rabbeinu Gershom echoes Rashi's point, emphasizing the incongruity of linking a m'drabanan tumah status to d'oraita karet for piggul and notar if their shiur isn't met d'oraita.⁴
_{3. Rashi, Menachot 54a s.v. וכן בפיגול ונותר. 4. Rabbeinu Gershom, Menachot 54a s.v. פיגול ונותר מדרבנן.}

Friction

Kushya

The most potent kushya arises from the baraita's inclusion of piggul and notar after claiming the calf meat's tumah is m'drabanan. Can a baraita conflate d'oraita prohibitions (like karet for piggul and notar) with a m'drabanan ruling on tumah? The baraita implicitly suggests that if piggul or notar swells to a k'zayit, it becomes subject to karet, which is d'oraita.⁵

Terutz

The Gemara brilliantly resolves this by reinterpreting the baraita's mention of piggul and notar as "טומאת פיגול וטומאת נותר"⁶ — a m'drabanan impurity of hands decreed upon piggul and notar. This maintains the m'drabanan context for the entire clause, allowing the baraita to consistently discuss rabbinic enactments.
_{5. Menachot 54a:11; Steinsaltz, Menachot 54a:11. 6. Menachot 54a:11.}

Intertext

The Mishna in Okhatzin 2:8 is the foundational discussion for "כמות שהן" vs. "כמות שהיו." Additionally, Mishna Teharot 3:6, discussing items that shrink and then swell, conclusively refutes the notion of "יש פסול בקידושין" (permanent disqualification), reinforcing the k'mot she'hein principle for subsequent halachic states.

Psak/Practice

The Gemara's intricate struggle to maintain the "כמות שהן" principle, even through nuanced reinterpretation of baraitot, indicates a strong meta-psak heuristic favoring the item's current state for halachic shiurim. This is generally reflected in poskim regarding k'zayit and other measures.

Takeaway

The sugya highlights the Amoraim's profound commitment to defining halachic reality by an item's present state, even when it demands complex textual gymnastics.