Zevachim 78

Sugya Map

• Issue: The principles of bitul (nullification) in mixtures, specifically concerning sacrificial blood, and the broader halachic categories of min b'mino (substance mixed with its own type) and min b'she'eino mino (substance mixed with a different type). The sugya explores whether bitul occurs quantitatively (majority) or qualitatively (taste), and the interplay with issurim (prohibitions) and kedusha (sanctity).
• Nafka Mina(s):
  • Validity of zrikat hadam (sprinkling sacrificial blood on the altar) when mixed with unfit blood or water.
  • The application of mitzvah of kisuy hadam (covering blood of chayot and birds).
  • Liability for malkot (flogging) when consuming mixtures of piggul, notar, or tameh meat.
  • Obligation of challah from dough mixtures and ability to fulfill mitzvah of matzah on Pesach.
  • Ritual purity of vessels immersed in a mikvah when containing other liquids.
• Primary Sources: Mishna Zevachim 78a, Gemara Zevachim 78a (statements of R' Yochanan, Rav Pappa, Reish Lakish, Rava, Abaye), Mishna Challah 3:7, Mishna Mikvaot 10:6, Tosefta Mikvaot 7:4.

Text Snapshot

The sugya opens with a Mishna presenting divergent views on blood mixtures:

Rabbi Yehuda says: Blood does not nullify blood. Therefore, the priest presents the blood of the mixture on the altar. If blood fit for presentation was mixed with the blood of unfit offerings, there is no remedy. Therefore, the entire mixture shall be poured into the drain running through the Temple courtyard. Likewise, if blood fit for presentation with blood of exudate, i.e., that exudes from the neck after the initial spurt following its slaughter concludes, which is unfit for presentation, the entire mixture shall be poured into the Temple courtyard drain. Rabbi Eliezer deems this mixture fit for presentation. Even according to the first tanna, if the priest did not consult the authorities and placed the blood on the altar, the offering is fit.^1

The Mishna establishes R' Yehuda's principle: "אין דם מבטל דם" (blood does not nullify blood). This phrase, in its stark simplicity, suggests a strong principle of min b'mino lo batel (a substance is not nullified by its own type), especially given the sanctity of sacrificial blood. However, the Mishna then introduces the case of dam פסולין (unfit blood) where the kasher blood is poured into the drain (yishafach la'amah), even if the fit blood is the majority. This apparent contradiction (no nullification vs. pouring away) sets the stage for the Gemara's discussion. R' Eliezer offers a more lenient view for unfit blood, deeming it fit. Crucially, the Tanna Kamma agrees that b'dieved (post-facto), if the priest sprinkles the blood, it is valid, hinting that the stringency is l'chatchila (ab initio) or mi'shum gezeirah (due to a rabbinic decree).

The Gemara then pivots to general bitul principles, exploring mixtures of water and blood, and later, the complex halachot of piggul and notar, challah, and mikvaot, through the lens of min b'mino, min b'she'eino mino, and ta'am k'ikar (flavor as primary essence).

^1 Zevachim 78a

Readings

Rashi: Min B'Mino Lo Batel as a Fundamental Principle

Rashi's commentary on the opening Mishna provides the foundational understanding of R' Yehuda's statement:

אין דם מבטל דם - דמין במינו לא בטיל ואפי' טיפה לתוך כלי גדול כשר לזריקה:^2 "Blood does not nullify blood" – for a substance of its own type is not nullified, and even a drop into a large vessel is fit for sprinkling.

Rashi clarifies that R' Yehuda's position posits a radical form of min b'mino lo batel. Even a single drop of sacrificial blood retains its efficacy and kedusha (sanctity) when mixed with other blood, regardless of the quantity of the latter. This is a crucial chiddush because it elevates the qualitative identity of the substance over any quantitative majority, at least within its own type. The implication is that the eidelkeit (preciousness) of dam korban prevents its nullification. This stands in contrast to common bitul rules where rov (majority) typically nullifies mi'ut (minority).

Tosafot: Connecting to Broader Sugyot on Bitul

Tosafot engage with Rashi's interpretation and immediately broaden the scope by linking this sugya to other discussions on bitul:

רבי יהודה אומר אין דם מבטל דם - בהקומץ רבה (מנחות דף כב.) פי' בקונטרס דלרב חסדא דאזיל בתר מבטל הויא דלא כרבי חייא ולעיל פי' בריש פירקין דאפילו לר' חנינא דאזיל בתר בטל דאיכא כמה משניות וברייתות דלא כר"ח:^3 "Rabbi Yehuda says: Blood does not nullify blood" – In HaKomatz Rabbah (Menachot 22b), Rashi explains that according to Rav Chisda, who follows the nullifying agent, this is not like Rabbi Chiya. And earlier, at the beginning of our chapter, Rashi explains that even according to R' Chanina, who follows the nullified agent, there are several Mishnayot and Baraitot that are not like R' Chiya.

Tosafot's chiddush here is to contextualize R' Yehuda's ruling within the larger machloket (dispute) regarding the gader (definition) of bitul. The rishonim debated whether bitul is defined by the mevatel (nullifying agent) or the nivtal (nullified agent). By referencing Menachot 22b, Tosafot highlight that the sugya on bitul of chametz in mixtures raises similar questions. They suggest that R' Yehuda's unique stringency here might find support even among those who generally permit bitul b'rov in min b'mino cases, due to the specific nature of dam korban. This indicates that the rule "אין דם מבטל דם" may not be a universal min b'mino lo batel rule, but rather a halacha l'maaseh specific to sacrificial blood, or at least a strong example of it. The complexity introduced by Tosafot forces us to consider the underlying philosophical approach to bitul that each Amora and Tanna might hold.

Rashi: The Role of Gezeirah

Further into the Mishna, Rashi comments on the instruction to pour unfit blood mixtures into the drain:

ישפך לאמה - ואפילו הכשר רבה עליו וכן בדם התמצית ישפך לאמה ואע"פ שדם הנפש רבה עליו ומשום גזירה כדמפרש בגמ':^4 "Shall be poured into the drain" – even if the fit blood is the majority over it, and likewise concerning dam hatimtzit (exudate blood), it shall be poured into the drain even if the dam hanefesh (lifeblood) is the majority over it, and this is mi'shum gezeirah (due to a rabbinic decree), as explained in the Gemara.

Rashi's chiddush is crucial for reconciling the Mishna's seemingly contradictory statements. He explains that even if the kasher blood is quantitatively dominant, the mixture with dam פסולין or dam hatimtzit is still poured out. This is not due to a failure of bitul in a quantitative sense, but rather a gezeirah (rabbinic decree). The Gemara will indeed elaborate on this, suggesting that the concern is shema yizrok dam פסולין l'chatchila (lest one intentionally sprinkle unfit blood). This introduces a critical dimension to bitul: it is not always a purely metaphysical or quantitative reality, but can be overridden or modified by rabbinic enactments to prevent michshol (stumbling blocks) or protect the sanctity of korbanot. This highlights that halacha often balances abstract principles with practical considerations and preventative measures.

Steinsaltz: A Modern Synthesis

Steinsaltz offers a concise, contemporary summary that synthesizes Rashi's initial point:

ר' יהודה אומר: אין דם מבטל דם, שלדעתו דבר שנתערב במינו, אפילו טיפה בכלי גדול — אינו בטל. ודם הקרבן כשר הוא, ויזרוק הכהן את דם התערובת על המזבח.^5 "R' Yehuda says: Blood does not nullify blood, for in his opinion, a substance mixed with its own type, even a drop in a large vessel, is not nullified. And the blood of the offering is fit, and the priest should sprinkle the mixed blood on the altar."

Steinsaltz's chiddush is in providing a clear, accessible restatement of Rashi's core understanding, reinforcing the principle of min b'mino lo batel as R' Yehuda's primary stance. He underscores that for R' Yehuda, the kasher blood maintains its full identity and validity, making the entire mixture suitable for sprinkling. This serves as a baseline for understanding the Mishna before the Gemara introduces the complexities of gezeirah and other forms of bitul.

^2 Rashi Zevachim 78a s.v. אין דם מבטל דם ^3 Tosafot Zevachim 78a s.v. רבי יהודה אומר אין דם מבטל דם ^4 Rashi Zevachim 78a s.v. ישפך לאמה ^5 Steinsaltz Zevachim 78a:1 s.v. ר' יהודה אומר: אין דם מבטל דם

Friction

The most significant friction point in our sugya revolves around the nature of ta'am k'ikar (flavor is like the essential substance) and its d'Oraita (Torah law) or d'Rabbanan (rabbinic law) status, particularly as it relates to min b'she'eino mino mixtures.

The Kushya: Reish Lakish vs. Mishna Challah

The Gemara states Reish Lakish's conclusion regarding piggul, notar, and tameh meat mixed together:

Conclude from it that the halakha that when a prohibited food imparts flavor to a permitted substance it prohibits it even when the permitted substance is the majority does not apply by Torah law, but by rabbinic law.^6

Reish Lakish argues that since issurim (prohibitions) nullify one another (issurim mevatalim zeh et zeh) and one cannot be flogged for consuming such a mixture (due to uncertain hatra'ah – forewarning), it implies that ta'am k'ikar is d'Rabbanan. If ta'am k'ikar were d'Oraita, the flavor of any issur would prohibit the entire mixture, and one should be liable for malkot for consuming that flavor.

Rava objects to this conclusion from a Mishna in Challah:

Rava raises an objection from a mishna (Ḥalla 3:7): In a case where one prepared a dough from wheat and from rice, if this mixture has the taste of wheat, it is obligated in the separation of ḥalla,... And this halakha applies even though the majority of the mixture is flour from rice. Apparently, the fact that the wheat imparts flavor to the dough renders it obligated in ḥalla even if the wheat is the minority.^7

Rava's kushya is powerful. The Mishna Challah clearly implies that if a minority of wheat imparts its taste to a majority of rice, the entire dough becomes obligated in challah. Since challah is a mitzvah d'Oraita connected to the five species of grain, this suggests that ta'am k'ikar is d'Oraita. This directly contradicts Reish Lakish's conclusion that ta'am k'ikar is d'Rabbanan. How can a d'Oraita obligation like challah be triggered by a d'Rabbanan principle of ta'am k'ikar?

The Terutz: Distinguishing Min B'Mino from Min B'She'eino Mino

The Gemara offers a resolution by distinguishing between different types of mixtures:

Rather, one must say that according to Reish Lakish, in a case of a type of food mixed with food not of its own type, such as wheat flour and rice flour, whose tastes are different, the status is determined by the flavor. Therefore, if the dough tastes like wheat, it has the halakha of a dough made from wheat. But if it is a type of food mixed with food of its own type, e.g., a mixture of piggul and notar meat, which is the case addressed by Reish Lakish, the status of the mixture is determined by the majority.^8

This terutz is a cornerstone of halachic bitul. It posits that the rule of ta'am k'ikar (flavor as essence) is indeed d'Oraita, but it applies specifically to min b'she'eino mino mixtures – where the components are fundamentally different types (e.g., wheat and rice, or a prohibited substance mixed with a permitted one that has a distinct taste). In such cases, if the minority issur imparts its flavor to the majority heter (permitted item), the entire mixture becomes prohibited d'Oraita. This is the source for the halacha of bitul b'shishim (nullification in 60 parts) in Kashrut, where a distinct issur needs 60 times its volume of heter to be nullified, otherwise natel ta'am (it imparted flavor) applies.

Conversely, for min b'mino mixtures – where the components are of the same type (e.g., piggul meat and notar meat, both being meat, or even dam korban with other blood as per R' Yehuda's initial statement) – the principle is bitul b'rov (nullification by majority). In such cases, if the issur is a minority of the same type, it is nullified by the majority of the heter (or another issur in Reish Lakish's case), regardless of taste, because taste is not the distinguishing factor. Therefore, Reish Lakish's case of piggul and notar meat, being min b'mino, follows bitul b'rov, and since one issur would nullify the other, no malkot are incurred.

This distinction harmonizes the seemingly contradictory sources, providing a nuanced framework for halachic mixtures that integrates both qualitative (flavor) and quantitative (majority) considerations.

^6 Zevachim 78a ^7 Zevachim 78a, citing Challah 3:7 ^8 Zevachim 78a

Intertext

The sugya on bitul is foundational to vast areas of Halacha, particularly Kashrut. Its principles echo through various texts, from Tanakh's emphasis on blood to later codifications.

Tanakh: The Sanctity of Blood

The unique treatment of blood in our sugya, specifically R' Yehuda's "אין דם מבטל דם," resonates deeply with the Tanakh's profound reverence for blood. The Torah explicitly connects blood with life itself and commands its proper handling:

כִּי נֶפֶשׁ הַבָּשָׂר בַּדָּם הִוא וַאֲנִי נְתַתִּיו לָכֶם עַל הַמִּזְבֵּחַ לְכַפֵּר עַל נַפְשֹׁתֵיכֶם כִּי הַדָּם הוּא בַּנֶּפֶשׁ יְכַפֵּר׃^9 "For the life of the flesh is in the blood, and I have given it to you upon the altar to make atonement for your souls; for it is the blood that makes atonement by reason of the life."

This verse from Vayikra underscores that sacrificial blood is not merely a ritual fluid, but intrinsically linked to nefesh (life/soul) and kappara (atonement). This inherent kedusha (sanctity) might explain why, for R' Yehuda, dam korban (sacrificial blood) is so potent that it cannot be nullified even by other blood. Its spiritual essence transcends mere physical quantity. The strictness of "ישפך לאמה" for mixtures with dam פסולין, even if mi'shum gezeirah, further emphasizes the need to safeguard the integrity of sacred blood, preventing any degradation or confusion. This echoes the broader biblical theme of preserving the purity of sacred objects and rites.

Shulchan Aruch: Codification of Bitul Principles

The distinction between min b'mino and min b'she'eino mino articulated in our sugya is codified as a cornerstone of Kashrut halacha in the Shulchan Aruch.

שולחן ערוך יורה דעה צח:א: כל איסורין שבתורה, בין של דאורייתא בין של דרבנן, בין של אכילה בין של הנאה, אם נתערבו במין מותר שלהן, בין יבש ביבש בין לח בלח, בטלים ברוב. ואם הוא מין במינו ואיסור הנאה, אפילו אלף לא בטיל. שולחן ערוך יורה דעה צח:ב: אם נתערב במין אחר שאינו מינו, אם יש בו בנותן טעם, אף על פי שיש הכשר רוב, הכל אסור. ושיעור נתינת טעם הוא ששים.^10

• YD 98:1 states that most issurim (prohibited items), whether d'Oraita or d'Rabbanan, issurei achila (eating prohibitions) or issurei hana'ah (benefit prohibitions), when mixed min b'mino (with their own type), are nullified by a majority (batel b'rov). However, for min b'mino where the issur is an issur hana'ah, it is never nullified ("אפילו אלף לא בטיל" – even a thousand parts won't nullify it). This last clause, often called cheftza bitul, is a significant stringency for items with inherent prohibited essence. R' Yehuda's "אין דם מבטל דם" for dam korban (which is kadosh) could be seen as an analogous stringency, where the kedusha prevents bitul.
• YD 98:2 addresses min b'she'eino mino mixtures (different types). Here, the rule is natel ta'am – if the issur imparts its flavor, the entire mixture is prohibited, even if the heter is the majority. The shiur (measure) for imparting flavor is typically shishim (60 times the volume of the issur). This directly reflects the Gemara's conclusion that for min b'she'eino mino, ta'am k'ikar is d'Oraita.

The Shach and Taz on these simanim further elaborate on the nuances, discussing exceptions, methods of estimation (shomnin), and the practical application of these rules. For instance, the Shach (YD 98:1 s.k. 1) clarifies the min b'mino lo batel for issurei hana'ah, connecting it to the intrinsic nature of the prohibited item. The sugya in Zevachim 78a, therefore, provides the textual bedrock for these fundamental principles that govern a vast array of halachic situations.

^9 Vayikra 17:11 ^10 Shulchan Aruch Yoreh De'ah 98:1-2

Psak/Practice

The principles elucidated in Zevachim 78a, particularly the distinction between min b'mino and min b'she'eino mino regarding bitul, are cornerstones of halachic practice, especially in Kashrut.

• Min B'Mino Lo Batel / Bitul B'Rov: For mixtures of the same type (min b'mino), the general rule is batel b'rov (nullified by a majority). If the prohibited item is a minority of its own type, it is nullified. However, for certain issurei hana'ah (prohibitions of benefit), such as chametz on Pesach or orla (fruit of the first three years), the rule is min b'mino lo batel – it is never nullified, even in an overwhelming majority. This reflects the unique stringency or intrinsic nature of these prohibitions. R' Yehuda's "אין דם מבטל דם" for sacred blood falls into a similar category, where the kedusha or the unique status of the item prevents simple bitul.
• Min B'She'eino Mino / Bitul B'Shishim: For mixtures of different types (min b'she'eino mino), the determining factor is ta'am (flavor). If the prohibited item imparts its flavor, the entire mixture is prohibited, regardless of majority. The halachic measure for flavor transfer is typically bitul b'shishim (nullification in 60 parts). If the heter (permitted substance) is 60 times the volume of the issur, it is assumed that no flavor was imparted, and the mixture is permitted. This is the practical application of the Gemara's conclusion that ta'am k'ikar is d'Oraita for min b'she'eino mino.
• Gezeirah: The Gemara's explanation of pouring out the blood mixture with dam פסולין mi'shum gezeirah highlights that rabbinic decrees can override or modify natural bitul principles to safeguard halachic integrity or prevent potential transgressions. This remains a vital consideration in p'sak, where chachamim sometimes institute stringencies beyond the letter of the law.
• Meta-Psak Heuristics: The sugya teaches a crucial heuristic: the gader (definition) of an item (e.g., its kedusha, its intrinsic prohibited nature, or simply its physical type) fundamentally impacts how bitul applies. Halacha is not a monolithic system of rules, but a nuanced framework that considers the essence of the entities involved.

Takeaway

The sugya in Zevachim 78a dissects the intricate laws of bitul, revealing that nullification is not a one-size-fits-all principle but rather a complex interplay of the item's nature (min b'mino vs. min b'she'eino mino), its qualitative essence (ta'am), quantitative dominance (rov), and sometimes, rabbinic decrees (gezeirot). It underscores that halacha rigorously balances metaphysical principles with practical considerations.