Sacrificial Blemish Versus Fatal Defect

בין מום לטרפה

A physical defect in a firstborn animal permits it to be slaughtered for ordinary food, but a mortal wound renders it entirely forbidden. How does the halacha distinguish between an external flaw that merely disqualifies an offering and a fatal trauma that ruins the animal as food?

The Torah commands that a kosher firstborn male animal possesses sanctity and must be sacrificed in the Temple. If it acquires a permanent מום (sacrificial blemish), it may not be offered on the altar; instead, it may be redeemed and slaughtered for personal consumption outside the Temple.

However, if an animal suffers a mortal physical injury, it becomes a טרפה (an animal with a fatal defect). A טרפה is completely forbidden to be eaten. The Mishnah lists defects such as a five-legged animal, a three-legged animal, and a שחול (an animal with a dislocated thigh).

These bodily deformations immediately raise a tension with the laws of טרפות (fatal physical defects). A dislocated joint or an extra limb can in some contexts render the animal non-viable and therefore strictly forbidden as food, yet here the Mishnah lists them as simple blemishes that permit slaughter for meat.

The question

Where is the precise line drawn between a joint dislocation that is merely a מום (blemish) and one that renders the animal a forbidden טרפה (fatal defect)?

Through the sources

The Mishnah (Gemara)

The Mishnah defines a שחול as an animal whose thigh has slipped out of place. It establishes that this condition is a permissible sacrificial blemish, enabling the firstborn to be slaughtered and eaten.

Rashi (Rishonim)

כגון דלא איעכל ניביה דאי איעכל ניביה טריפה נמי הוי

Rashi harmonizes our Mishnah with the laws of טרפות by qualifying the injury. The dislocation remains an edible blemish only when its tendons did not decay, whereas decayed tendons would create a fatal defect.

Tosafot (Rishonim)

וקשיא לפירושו דאיכא מאן דטריף התם אפילו לא איעכול ולא איפסוק אלא יש לפרש דנשמטה כן מתחלת ברייתה

Tosafot objects to Rashi's distinction because some opinions consider any dislocation fatal even without decaying tendons. Instead, Tosafot asserts the Mishnah refers to an animal dislocated from its initial formation, which poses no threat to life.

Ohr Zarua (Rishonim)

אבל חיסר ויתיר ברגל טריפה נמי הוה מ"ט כל יתר כניטל דמי. יתר אחד כחסר אחד והוי כבעל רגל אחד וטריפה דהוי כשמוטת ירך בבהמה.

The Ohr Zarua analyzes limbs mentioned in the Mishnah and notes that an extra hindleg makes an animal a טרפה. Under the principle that any extra limb is viewed as absent, it resembles a completely severed hip joint, which is mortally defective.

Rashash (Acharonim)

דלפי מה שפסק הרמ"א שם דאיעכל ניביה בלי שמוטת ירך כשרה. א"כ יש נ"מ רבתי באם נשמט הירך מתחלת ברייתה ואח"כ איעכל ניביה

Rashash analyzes the practical difference between the Rishonim. If an animal is born dislocated and later its tendons decay, its viability depends on whether a congenital flaw protects it from being classified as a trauma-induced fatal injury.

Tur (Halacha)

The Tur rules definitively that a slipped thigh joint constitutes a valid blemish for a firstborn. He adopts Rashi's categorization that it is a blemish without decaying tendons, permitting the animal for non-sacrificial slaughter.

Arukh HaShulchan (Halacha)

Arukh HaShulchan clarifies that a מום must be an observable blemish, not hidden. Therefore, שחול must mean the joint exited completely from its socket, yet it remains kosher to eat as long as its connective cords did not rot.

Ways to understand it

Physiological Viability Criterion

A dislocation becomes a mortal defect only when accompanied by rotting tissue, specifically when the connective tendons decay. If the bone simply slipped out of its socket, the animal can survive, leaving the condition as merely an external physical flaw rather than a fatal wound,.

Congenital Versus Traumatic Origin

Any post-birth traumatic dislocation endangers the animal's life and could render it a טרפה according to strict views in the Gemara. Therefore, the case in the Mishnah must be an animal formed abnormally from the womb, which constitutes an anatomical irregularity rather than a lethal injury.

Where it lands

The halacha follows the distinction of physiological viability, ruling that an out-of-socket joint constitutes an evident blemish on which a firstborn may be slaughtered. As codified in the Tur, as long as the tendons have not decayed, the injury does not cross the threshold of a fatal טרפה.

An anatomical deformity is a kosher blemish unless severe tissue deterioration compromises the vital viability of the animal.

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