Mishnah Middot 3:2-3

Sugya Map

• The Issue: The structural geography of the Second Temple Altar (Mizbe’ach) and the functional mechanism of its drainage system. Specifically, the reconciliation of the "foundation" (Yesod) dimensions with the hydraulic requirements of shiyarei damim (the residual blood of sacrifices).
• Nafka Mina:
  • Halakhic validity of the altar’s service if blood is poured outside the designated Yesod zones.
  • The architectural definition of "squareness" in sacred space—whether the Yesod must be continuous or if it is functionally defined by the drainage apertures.
• Primary Sources:
  • Mishnah Middot 3:1–3.
  • Ezekiel 43:16 (the source for the Mizbe’ach dimensions).
  • Zevachim 53b (regarding the flow of blood).
  • Yoma 58b (the disposal of blood into the Kidron).

Text Snapshot

• Mishnah Middot 3:2: "בקרן מערבית דרומית היו שני נקבים כמין שני חוטמין דקין, שיהיו הדמים הניתנין על יסוד מערבי ועל יסוד דרומי יורדין בהן ומתערבין באמה ויוצאין לנחל קדרון."
  • Leshon nuance: The Mishna uses the metaphor k'min shenei chotmin dakin ("like two small nostrils"). The use of "nostrils" implies an organic, non-mechanical flow, suggesting a system designed to prevent clogging while maintaining a distinct separation (hifridut) of the blood types until they reach the channel.

Readings

Rambam: The Geometry of the Void

Rambam (Commentary on the Mishna, ad loc.) introduces a critical chiddush: the Yesod (foundation) does not surround the entire altar symmetrically. He notes that the southeastern corner lacks a Yesod entirely. His reading transforms the altar from a simple nested geometric shape into a functional hydraulic machine. Rambam posits that the Yesod is not merely an aesthetic base, but a topographical guide for the blood. By declaring that the southeastern corner is devoid of a Yesod, he forces the reader to acknowledge that the Mizbe’ach is asymmetric by design. This serves his broader halakhic framework: the Yesod is a ritual requirement for the validity of the shiyarei damim. If the blood doesn't hit the Yesod, the service is invalid. Rambam’s geometry ensures that the "path" of the blood is physically dictated by the absence and presence of the Yesod.

Tiferet Yisrael (Yachin): The Hydraulic Separation

The Yachin provides a masterclass in forensic architecture. He addresses the obvious kushya: how can one pour thick blood into two "nostrils" without spilling it onto the floor? He argues that the blood was not poured directly into the holes but onto the Yesod itself. The Yesod functioned as a catchment area—a "gutter" system. He suggests that the Yesod had a slightly raised lip (safah) so that the blood would not drip onto the floor of the Azarah but would instead "crawl" (zochalin) toward the specific nostril assigned to it. His chiddush is that the altar was essentially a gravity-fed filtration system. The distinction between the two nostrils (one for chata'ot p'nimiyot and one for the rest) is not just a layout preference; it is a ritual requirement to prevent the mixing of different categories of blood before they reach the main drainage pipe.

Friction: The "Nostril" Paradox

The Kushya

The primary tension lies in the physical dimensions. If the Yesod is narrow (a single cubit) and the blood is viscous, how can the Mishnah claim that the blood reaches the Kidron via "nostrils"? If the blood is poured onto the Yesod, the volume of blood from a public sacrifice would likely overflow a one-cubit foundation instantly, potentially causing it to splash onto the Azarah floor—thereby invalidating the sacrifice, as the shiyarei damim must be poured al ha-yesod.

The Terutz

The Yachin suggests that the "nostrils" were not the primary drainage, but the terminal points of a designed slope on the Yesod ledge. The "raised lip" he posits effectively turns the entire Yesod into a funnel. A more radical terutz suggests that the "nostrils" were not purely physical apertures but were widened at the base, functioning like a modern sink drain, where the surface tension of the liquid is broken by the shape of the opening. The Mishnah emphasizes "nostrils" to teach that the flow was constant and controlled, not a deluge. The ritual precision here is found in the speed of the disposal—if it flows too fast, it overflows; if too slow, it congeals. The "nostril" is the perfect engineering solution to the viscosity of animal blood.

Intertext

• Zevachim 53b: The Gemara debates the exact placement of the shiyarei damim. It establishes that the blood must touch the Yesod. The Mishnah in Middot acts as the technical manual for the Zevachim discussion.
• Ezekiel 43:16: The source text for the "square" altar. The Mishnah’s struggle to define the "four equal sides" of the altar while accounting for the Yesod’s asymmetry is a direct response to the prophetic vision. The Mishnah treats the prophet's "square" as a functional ideal, which the priestly engineers had to approximate in a physically finite space.

Psak/Practice

In the contemporary study of the Beit HaMikdash, this sugya informs the "meta-psak" regarding sacred architecture. The lesson is that kodesh (holiness) is not abstract; it is bounded by physical reality. The Mizbe’ach cannot be understood as a geometric shape (a square) but must be understood as a site of flow. If we were to apply this to modern synagogue architecture or ritual space, the takeaway is the "functional threshold." Just as the Yesod mediates between the holy and the profane (the Azarah floor), all sacred spaces require a "drainage" logic—a way to ensure that what is intended for the altar does not bleed into the common space.

Takeaway

The Altar is not a static monument; it is a hydraulic engine. The holiness of the Mizbe’ach is maintained as much by its drainage as by its fire.