All meal offerings come as matzah — except the leavened [loaves] of the Todah and the two loaves, which come as chametz. R' Meir: one takes leaven from within [the dough] and leavens them. R' Yehuda: that is not optimal — bring leaven [from outside], place it in the measuring vessel, then fill it with flour. They said to him: that too would be short or over [the required measure].
Fuchsia — Rule
Gold — Tana
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The Shtei HaLechem — the only communal minhah that comes as chametz
All other minhaos — matzah
כָּל הַמְּנָחוֹת בָּאוֹת מַצָּה
The universal rule: all meal offerings are matzah. Chametz is generally prohibited in the Temple (Vayikra 2:11 — "you shall not burn any leavened dough or honey as a fire offering"). The matzah rule is the default for the entire world of minhaos.
The Shtei HaLechem — chametz
שְׁתֵּי הַלֶּחֶם בָּאוֹת חָמֵץ
The Shtei HaLechem is the exception that defines itself: two wheat loaves, fully leavened, brought on Shavuos. This is the first fruits of the wheat harvest — representing bread as humans actually eat it. The chametz is not incidental but essential to the Korban's identity.
How to leaven the Shtei HaLechem — the three-way dispute
Three approaches — the goal is a precisely measured isaron of chametz dough
R' Meir
שְׂאֹר בּוֹדֶה לָהֶן מִתּוֹכָן
Separate a bit of the flour, allow it to ferment into leaven, then add it back to leaven the entire batch. The leaven comes from within the dough itself — no external addition needed. Simple, but requires extra time.
R' Yehuda
מֵבִיא אֶת הַשְּׂאֹר — נוֹתֵן לְתוֹךְ הַמִּדָּה
Bring aged external leaven (a more effective leavening agent), place it in the measuring vessel, then fill with flour. The aged leaven leavens more reliably. Problem: this makes measurement imprecise — the leaven displaces some flour so the measure will be short or over.
Chachamim — refutation of R' Yehuda · Halacha follows R' Meir
אַף הִיא הָיְתָה חֲסֵרָה אוֹ יְתֵרָה
R' Yehuda's method produces an imprecise measure — the leaven volume is unpredictable. Therefore R' Meir's method is used: the leaven comes from within the flour itself. The halacha follows R' Meir.
The Todah — the other exception
The Todah offering (thanksgiving offering) also includes chametz loaves — ten of the forty loaves that accompany it. But these are private loaves eaten by the owner; they never go on the Mizbeach. The Shtei HaLechem's chametz is unique: it is a communal offering brought to the Temple as a Korban. This is the only case in all of Temple law where a communal Korban comes as chametz.
Position in the Omer to Shavuos arc — 43 mishnayos
Preceding · Mishnah 23
Menachos 10:6
The Bridge — the Shtei HaLechem permits new grain in the Temple
Current · Mishnah 24
Menachos 5:1 — Chametz
Movement III·A
The first defining feature of the Shtei HaLechem: it comes as chametz — the only communal Korban to do so. This single fact drives the entire chain of consequences in Mishnayos 25–27: no Mizbeach share, must come down if placed there, no liability for offering outside. Chametz is not a detail — it is the Shtei HaLechem's essential identity.
Following · Mishnah 25
Menachos 6:2
Because it is chametz — no Mizbeach share. Power of Kohanim vs. power of the altar.