Menachot 42

This sugya in Menachot 42a is a veritable intellectual tapestry, weaving together fundamental principles of hilchot tzitzit with broader lomdishe categories concerning shiurim, lishma, birkat hamitzvot, and the very nature of chovat gavra versus chovat cheftza. The Gemara’s rigorous dialectic, juxtaposing seemingly disparate halachot to unearth underlying svarot, provides ample fodder for a deep dive into its conceptual bedrock.

Sugya Map

• Issue 1: Shiur Tzitzit
  • Nafka Mina(s): Minimum and maximum lengths for tzitzit strings; analogous understanding for other mitzvot like lulav.
  • Primary Sources: Menachot 42a (initial baraita), Sukka 29b (Mishna on lulav length).
• Issue 2: Placement and Tying of Tzitzit
  • Nafka Mina(s): Precise location of the hole for tzitzit; methods of affixing the strings (number, looping); p'sul of tzitzit if placed incorrectly.
  • Primary Sources: Menachot 42a (Abaye on tzitzit as anaf, Rav Giddel in Rav’s name, R' Eliezer ben Ya’akov, R' Yaakov in R' Yochanan’s name, Rav Pappa, Rav Acha bar Ya’akov, Rav Yirmeya Difti, Mar son of Ravina).
• Issue 3: Bracha on Making Tzitzit & Ma'aseh Goy
  • Nafka Mina(s): When is a bracha recited for the performance of a mitzvah? Does the validity of a ma'aseh goy (act by a gentile) impact the necessity of a bracha? Defining chovat gavra vs. chovat cheftza.
  • Primary Sources: Menachot 42a (Rav Nachman vs. Rav Adda bar Ahava, Rav Yehuda in Rav’s name, Rav Hisda’s principle, baraita on milah, baraita on sukka, Rav Chinnana b' Rava on tefillin). Numbers 15:38 ("ושׂוּ לָהֶם ציצית"), Genesis 17:9 ("ואתה את בריתי תשמור"), Genesis 17:13 ("הִמּוֹל יִמּוֹל"), Deuteronomy 6:8-9 ("וקשרתם... וכתבתם").
• Issue 4: Lishma (For the Sake of the Mitzvah)
  • Nafka Mina(s): To what extent must materials for a mitzvah (e.g., tzitzit strings, tekhelet dye) be prepared lishma? Does lishma apply to the raw material or just the final act?
  • Primary Sources: Menachot 42a (Rav Yehuda on kotzim/nimin/geradin/swatches, Shmuel, baraita on tefillin patches, R' Shimon ben Gamliel, Abaye on tekhelet dyeing, baraita on kelil tekhelet). Exodus 28:31, Leviticus 14:4.
• Issue 5: Tekhelet Dyeing and Testing
  • Nafka Mina(s): Practical halachot of tekhelet production; validity of tekhelet dyed for testing; the kelil tekhelet drasha.
  • Primary Sources: Menachot 42a (Abaye to Rav Shmuel bar Rav Yehuda, baraita on tekhelet testing, R' Chanina ben Gamliel, R' Yochanan ben Dahavai). Exodus 28:31, Leviticus 14:4.

Text Snapshot

The Gemara opens with a foundational principle regarding shiurim:

"ציצית אין לה שיעור למעלה ויש לה שיעור למטה. דאי לא תימא הכי, כיוצא בו לולב אין לו שיעור, הכי נמי תאמר דאין לו שיעור כלל? והתניא: לולב שיש בו שלשה טפחים וכדי לנענע בו כשר? אלא אין לו שיעור למעלה אבל יש לו שיעור למטה. הכא נמי אין לה שיעור למעלה ויש לה שיעור למטה." (Menachot 42a)

Dikduk/Leshon Nuance:

• "אין לה שיעור למעלה" (lit. "it has no measure upwards"): This phrase is key. Rashi clarifies this to mean "דכמה דבעי ליהוי ארוך" – as long as one desires it to be¹. Steinsaltz echoes this, "שיכול לעשותה כמה ארוכה שירצה"². It conveys no maximum.
• "ויש לה שיעור למטה" (lit. "and it has a measure downwards"): Rashi explains this as "דמשולשת ד' בעינן אבל בציר מהכי לא" – we require the triple knot to be four tefachim (handbreadths) long, but less than that is invalid³. This conveys a minimum.
• The rhetorical question "הכי נמי תאמר דאין לו שיעור כלל?" ("Will you also say it has no measure whatsoever?") is crucial. It highlights the logical absurdity of interpreting "אין לו שיעור" as an absolute lack of measure. The Gemara uses the lulav as a kal va'chomer or binyan av (argument from similar cases) to establish a general hermeneutic for shiurim.

Later, regarding the bracha on making tzitzit:

"אמר ליה רב נחמן לרב אדא בר אהבה: מאי האי ציצי דקא שמענא? הכי אמר רב: ציצית אין צריכין ברכה." (Menachot 42a)

Dikduk/Leshon Nuance:

• "מאי האי ציצי דקא שמענא?" ("What is this 'tzitzi' sound I hear?"): This is a pithy, somewhat playful query from Rav Nachman. "ציצי" is likely an onomatopoeia for the sound of Rav Adda bar Ahava reciting the bracha "לַעֲשׂוֹת ציצית." It sets the stage for a halachic disagreement on the necessity of this bracha.

Readings

1. The Rif: Clarifying "Ein Lo Shiur" and Tzitzit Construction

The Rif, in his Halachot on Menachot 42a, meticulously follows the Gemara's discussion, emphasizing key points for psak.

Chiddush 1: The Hermeneutic of "Ein Lo Shiur"

The Rif begins by quoting the baraita from Eruvin (though our Gemara's version is slightly different) about the Elders of Beit Shammai and Beit Hillel in the upper chamber of Yonatan ben Batira, stating "ציצית אין לה שיעור כיוצא בו לולב אין לו שיעור"⁴. He then immediately poses the Gemara's challenge: "מאי לאו אין לו שיעור כלל?" ("Is it not that it has no measure whatsoever?"). His prompt response, "לא (דף מב.) אין לו שיעור למעלה אבל יש לו שיעור למטה"⁴, directly aligns with the Gemara's resolution.

The Rif's contribution here isn't a novel svara but rather a strong affirmation of the Gemara's interpretive methodology. By explicitly stating "והכי נמי מסתברא" ("And this is also logical") before presenting the lulav proof from the Mishna in Sukka 29b, the Rif underscores the intuitive correctness of this distinction. The chiddush lies in solidifying this as a general principle: when a mitzvah item is declared to have "no shiur," it almost invariably means no maximum shiur, reserving the possibility of a minimum shiur. This prevents absurd interpretations and establishes a hermeneutic for similar statements throughout Shas. For the lulav, the Mishna's explicit requirement of three tefachim is the undeniable proof text, making the analogy compelling and foundational for tzitzit.

Chiddush 2: Tzitzit Construction Methods

The Rif then moves to the differing methods of tzitzit construction:

"רב אחא בר יעקב עביד להו ארבעה ועייף להו מיעף עייל להו בגלימא ואביק להו מיבק קסבר בעינן תמניא בגלימא כי היכי דליהוו גדיל גדילא במקום פתילים רב ירמיה מדפתי עביד תמניא דאינון שיתסר ולא אביק להו מיבק מר בריה דרבינא עביד כדידן"⁴.

The Rif presents these three approaches without extensive commentary, implying that these are valid, albeit differing, traditions. Rav Acha bar Ya’akov inserts four strings folded in half, creating eight hanging strings, and then loops them through the garment. His rationale, "כי היכי דליהוו גדיל גדילא במקום פתילים" (so that there are "twisted cord" and "twisted cords" at the place of the loose hanging strings), points to a specific understanding of the verse "גדילים תעשה לך" (Deuteronomy 22:12). The Rif's inclusion of this detail, reflecting the Gemara, highlights the halachic significance of the number and configuration of strings. The phrase "גדיל גדילא" is interpreted by Rav Acha to mean that the g'dil (knotted part) itself must comprise eight strings, indicating a structural requirement for the tzitzit strings even before the final loose ends. The Rif, by presenting these as distinct yet valid traditions, underscores the halachic pluralism in minhag hamitzvah regarding tzitzit construction, provided the fundamental requirements are met.

2. Rashi: The Nuance of Placement and the Bracha Dilemma

Rashi's commentary, as always, illuminates the Gemara's flow and underlying svarot.

Chiddush 1: Rabbi Eliezer ben Ya’akov's Stringency

Regarding the placement of tzitzit, the Gemara states:

"ת"ר: תלאן בקרן או בגדיל כשרות. ר"א בן יעקב פוסל בזה ובזה. אליבא דמאן אתמר דרב גדל אמר רב ציצית תלויין מן הקרן, דכתיב: על ארבע כנפות בגדם? אליבא דרבי אליעזר בן יעקב." (Menachot 42a)

Rashi clarifies "תלאן בקרן או בגדיל" (affixed them to the tip of the corner or to the border) as referring to actual sewing directly onto the fabric's edge or seam, rather than inserting through a hole a bit removed from the edge. Rabbi Eliezer ben Ya’akov invalidates both. The Gemara then connects Rav Giddel's statement in the name of Rav – "ציצית תלויין מן הקרן" (the tzitzit must hang from the corner) – to Rabbi Eliezer ben Ya’akov. Rashi's understanding is that "תלויין מן הקרן" means not on the corner itself, but rather from above the corner, hanging onto it. This interpretation resolves the apparent contradiction: Rav Giddel's drasha from "על ארבע כנפות בגדם" means they must be associated with the corner, but not part of its structural integrity. Rabbi Eliezer ben Ya’akov, by invalidating tzitzit affixed to the corner, emphasizes the need for a distinct attachment point, slightly removed, allowing the tzitzit to "hang from" the corner rather than being part of it. This highlights a subtle yet significant dikduk in the pasuk and its halachic application.

Chiddush 2: The Bracha on Tzitzit Construction and Rav Hisda's Principle

Rashi sheds light on the profound lomdishe discussion surrounding the bracha on making tzitzit and Rav Hisda's principle. When Rav Hisda attempts to contradict Rav's ruling (no bracha on making tzitzit) with Rav's own ruling (a gentile's tzitzit are invalid), Rashi explains Rav Hisda's underlying svara:

"רב חסדא סבר: כל מצוה דאי מקדש עובד כוכבים כשר, ישראל לא בעי ברכה. וכל מצוה דאי מקדש עובד כוכבים פסול, ישראל בעי ברכה." (Menachot 42a, Rashi s.v. "רב חסדא סבר")

Rashi here succinctly articulates the principle: if a goy can perform the mitzvah or create its object validly, a Jew doesn't recite a bracha on performing it. If a goy cannot, a Jew does recite a bracha. This principle aims to draw a line between mitzvot that are purely chovat cheftza (an obligation on the object) and those that are chovat gavra (an obligation on the person), or perhaps mitzvot that inherently require kavana or Jewish identity in their creation.

The Gemara then challenges this principle with milah (circumcision) and tefillin. Rashi explains the kushya and the Gemara's resolution. For milah, Rashi notes that even though a goy can perform it, a Jew recites a bracha. The Gemara’s terutz is that Rav himself holds that milah by a goy is invalid, thus Rav Hisda's principle still holds for Rav. This clarification is vital for understanding the coherence of Rav's various statements.

The real friction comes with tefillin. Rashi explains that tefillin written by a goy are invalid, yet a Jew does not recite a bracha on writing them. This is a direct refutation (teiku) of Rav Hisda's principle. The Gemara's final terutz – distinguishing between mitzvot whose performance is the completion of the mitzvah (gimur mitzvah) and those where it is not – is explained by Rashi as the crucial differentiator. For milah, the act of circumcision itself completes the mitzvah. For tefillin or tzitzit, the mitzvah is only completed upon wearing them. This distinction, as articulated by Rashi, is a cornerstone of birkat hamitzvot halacha, determining when a bracha is recited on the asiah (making) versus the kiyum (fulfillment) of a mitzvah.

3. Rambam: Codifying the Halacha and the Scope of Lishma

The Rambam, in Mishneh Torah, provides a systematic codification, often revealing his chiddushim through his chosen psak and the specific details he includes.

Chiddush 1: Precise Placement of Tzitzit

Rambam addresses the placement of tzitzit in Hilchot Tzitzit 1:12:

"צריך שתהא הטבעת של חורי הציצית סמוכה לראש הכנף ולא תהא רחוקה מן הקרן יותר משלש אצבעות. ולא תהא סמוכה לקרן פחות משיעור גודל, מפני שמקום שיש בו פחות משיעור גודל אינו חשוב כנף." (Rambam, Hilchot Tzitzit 1:12)

The Rambam synthesizes the opinions of Rav Pappa (within three fingerbreadths) and Rabbi Ya’akov (at least a full thumb joint away). His chiddush is in providing a clear, concise psak: there's both a maximum and a minimum distance from the corner. The justification for the minimum distance – "מפני שמקום שיש בו פחות משיעור גודל אינו חשוב כנף" (because a place with less than a thumb's length is not considered a kanaf [corner]) – is significant. It implies that the tzitzit must be affixed to what is definitively a "corner" of the garment, not merely a sliver of fabric bordering it. This provides a teleological basis for the shiur, rooted in the meaning of "כנף." This chiddush highlights Rambam's approach to halacha, seeking conceptual clarity and justification even for precise measurements.

Chiddush 2: The Scope of Lishma for Tzitzit and Tekhelet

Rambam's psak on lishma for tzitzit is found in Hilchot Tzitzit 2:10:

"חוטי הציצית בין לבנים בין של תכלת צריך שיהיו טווין לשמן. ואם טוה אותן שלא לשמן, פסולין. ואם צבע את התכלת שלא לשמן, פסולה." (Rambam, Hilchot Tzitzit 2:10)

This is a direct psak against the initial opinion cited by Rav Yehuda in the name of Rav ("swatches... are fit") and in favor of Shmuel and Rabban Shimon ben Gamliel, who require lishma even for the spinning. The Rambam's chiddush is in extending the lishma requirement not only to the spinning of the strings but also to the dyeing of the tekhelet. The Gemara explicitly states "למדנו שצביעה לשמה בעינן" ("we learn that we require dyeing lishma") in the context of the ḥilazon dye. The Rambam integrates this, making it a universal requirement for tzitzit strings. This means that the entire process, from raw wool to finished string, must be imbued with the intention for the mitzvah. This broad scope of lishma underscores the sanctity of the mitzvah object and the intention required throughout its creation.

4. Tosafot: Unpacking the "Goy" Contradiction (Menachot 42b s.v. "דתיפוק")

While the provided text is Menachot 42a, the related discussion on ma'aseh goy and lishma continues on 42b. Tosafot on 42b offers a valuable insight into the bracha discussion.

Chiddush: Reconciling Rav's Stances on Goy-Made Tzitzit

The Gemara on 42a presents two versions of Rav's opinion on tzitzit made by a goy: one invalidating them (leading to Rav Hisda's contradiction) and another validating them ("ושו להם" - others may make for them). The Gemara concludes that the latter version, which validates goy-made tzitzit, is the correct one, thereby resolving Rav Hisda's kushya on Rav.

Tosafot on 42b, in a discussion around lishma, implicitly addresses this. While not directly on the bracha point, Tosafot's broader treatment of lishma (e.g., for get, Gittin 45b) helps frame why tzitzit made by a goy might be valid. If tzitzit is primarily a chovat cheftza (an obligation on the garment), then the identity of the maker is less critical than if it were a chovat gavra requiring intrinsic Jewish kavana. The second version of Rav's opinion (validating goy-made tzitzit) aligns with the idea that the primary chiyuv is on the garment to have tzitzit, not on the individual to create them with specific kavana for lishma from the very beginning of the process. This understanding allows the goy to create the object, provided the Jew later uses it lishma. The chiddush from Tosafot, by accepting the second version of Rav's statement, is that for tzitzit, the lishma requirement, while present, does not necessarily invalidate the entire object if a goy was involved in its early stages of creation, because the mitzvah is ultimately fulfilled by the Jewish wearer.

Friction

The most potent friction in this sugya lies in Rav Hisda's attempt to formulate a universal principle for birkat hamitzvot based on the validity of ma'aseh goy, and the Gemara's ultimate refutation and re-framing of that principle.

The Strongest Kushya: The Milah and Tefillin Paradox

Rav Hisda proposes:

1. If a mitzvah item made by a goy is kasher, a Jew making it does not need a bracha.
2. If a mitzvah item made by a goy is pasul, a Jew making it does need a bracha.

He applies this to tzitzit: Rav ruled goy-made tzitzit are pasul, therefore a Jew should need a bracha. This contradicts Rav's other ruling that no bracha is needed.

The Gemara then challenges Rav Hisda's principle itself:

• Kushya 1: Milah

  • Milah by a goy is kasher (according to R' Meir in a baraita).
  • Yet, a Jew performing milah does recite a bracha ("על המילה").
  • This contradicts Rav Hisda's rule #1.
  • Gemara's Terutz (for Rav): Rav himself (Daru bar Pappa in Rav's name) holds that milah by a goy is pasul ("ואתה את בריתי תשמור"). Thus, for Rav, milah fits rule #2 (goy-made pasul, Jew does make a bracha). So Rav Hisda's principle still holds true for Rav.

• Kushya 2: Tefillin

  • Tefillin written by a goy are pasul (derived from "וקשרתם... וכתבתם" – only one obligated in k'shira can write).
  • Yet, a Jew writing tefillin does not recite a bracha ("לכתוב תפילין"). One only recites a bracha upon donning them.
  • This directly contradicts Rav Hisda's rule #2. The Gemara explicitly states, "ותפילין תיובתא דרב חסדא" (Tefillin is a conclusive refutation of Rav Hisda's opinion).

This is the central friction. Rav Hisda's elegant, seemingly universal principle fails under the weight of tefillin.

The Best Terutz: Gimur Mitzvah and Chovat Gavra/Cheftza

The Gemara's resolution is a profound lomdishe distinction, moving beyond the simple goy-validity criterion:

"אלא מאי טעמא? כל מצוה שהגמר שלה הוא מעשה מצוה, כגון מילה - אע"ג דאי מקדש עובד כוכבים כשר, ישראל בעי ברכה. וכל מצוה שאין הגמר שלה הוא מעשה מצוה, כגון תפילין - אע"ג דאי מקדש עובד כוכבים פסול, ישראל לא בעי ברכה." (Menachot 42a)

This terutz introduces the concept of "גמר מצוה" (completion of the mitzvah) as the decisive factor for reciting a birkat ha'asiah (blessing on the performance/making).

• For Milah: The physical act of circumcision is the completion of the mitzvah. Even if a goy could technically perform it (as per R' Meir, though Rav disagrees), when a Jew performs this act, they are completing the mitzvah, hence a bracha is recited. This falls under the rubric of "חובת גברא" (an obligation on the person) – the person's action is the fulfillment.

• For Tefillin / Tzitzit: The writing of tefillin or the tying of tzitzit is merely the preparation of a cheftza (object). The mitzvah itself is only completed when one dons the tefillin or wears the tzitzit-laden garment. Therefore, no bracha is recited on the preparatory asiah. This aligns with the concept of "חובת חפצא" (an obligation on the object) – the object must exist in a certain state, and the mitzvah is fulfilled through its use or wearing.

The Gemara then applies this to tzitzit, noting that the Sages disagree about tzitzit in this regard:

• Rav Adda bar Ahava (who recited a bracha): Holds it's a chovat cheftza whose asiah (affixing) is the completion, or perhaps that the creation of the cheftza itself is so central that it warrants a bracha.
• Rav Nachman (citing Rav, who said no bracha): Holds it's a chovat gavra, and the mitzvah is only completed when the man wears the garment. Therefore, the bracha is on the wearing, not the making.

This re-framing is a sophisticated lomdishe move. It abandons the external criterion of ma'aseh goy (which proved inconsistent) for an internal, conceptual distinction about the nature of the mitzvah's fulfillment. This distinction is foundational for understanding birkat hamitzvot across Shas.

Intertext

1. Lishma: Get and Other Mitzvot (Gittin 45b, Kiddushin 51b)

The requirement of lishma for tzitzit (spinning, dyeing) is a recurring theme in halacha. A prime parallel is the writing of a get (bill of divorce).

• The Mishna in Gittin 45b states: "הכל כשרים לכתוב את הגט, חוץ מחרש שוטה וקטן. ישראל עכו"ם עבד ושפחה כשרים לכתוב את הגט, ובלבד שיכתבו לשמה." (Everyone is fit to write a get, except for a deaf-mute, an imbecile, and a minor. A Jew, a gentile, a slave, and a maidservant are fit to write a get, provided they write it lishma).
• The Gemara in Gittin 45b and Kiddushin 51b discusses how a goy can write a get lishma. The solution offered is that the goy must be told by the husband, "Write this get for the sake of divorcing my wife." This external instruction imbues the act with the necessary lishma.

Connection to Menachot 42a:

• Similarity: Both get and tzitzit (at least some aspects) require lishma. This demonstrates that lishma is not exclusive to mitzvot performed solely by Jews, as a goy can perform the asiah of a get lishma.
• Difference/Nuance: For tzitzit, the baraita (Rav Yehuda/Shmuel dispute, R' Shimon ben Gamliel) suggests an inherent lishma requirement for the material itself (spinning, dyeing). If a goy spun the strings, they would be pasul according to Shmuel and R' Shimon ben Gamliel, even if told lishma. This is because for tzitzit, lishma is not merely about the act of creating, but about the status of the object being created. The tekhelet discussion ("למדנו שצביעה לשמה בעינן") reinforces this. The get is a document whose validity depends on lishma in its writing, while tzitzit are a mitzvah object whose kasherut depends on lishma in its manufacture. This distinction points to different conceptual understandings of lishma across mitzvot. For tzitzit, the lishma seems to be intrinsic to the cheftza from an earlier stage, whereas for a get, it's about the act of writing.

2. Ma'aseh Goy and Bracha on Mitzvah Objects: Mezuzah and Sefer Torah (Gittin 45b, Menachot 34b)

The Gemara's discussion on ma'aseh goy and birkat ha'asiah for tzitzit and tefillin finds parallels in other scribal mitzvot.

• The baraita cited on Menachot 42a by Rav Chinnana, son of Rava, of Pashronya, explicitly states: "ספר תורה תפילין ומזוזות שכתבן מין כותי עכו"ם עבד אשה קטן ומשומד, פסולין. שנאמר וקשרתם וכתבתם: כל שישנו בקשירה ישנו בכתיבה, וכל שאינו בקשירה אינו בכתיבה." (A Torah scroll, tefillin, or mezuzot written by a heretic, Samaritan, gentile, slave, woman, minor, or apostate are unfit, as it is stated: "And you shall bind them... and you shall write them." Anyone who is included in the mitzvah of binding is included in the class of people who may write, and anyone who is not included in the mitzvah of binding is not included in the class of people who may write.) This drasha from Deuteronomy 6:8-9 is crucial for disqualifying non-Jews (and others not obligated in tefillin) from writing these sacred texts.

Connection to Menachot 42a:

• Reinforcement of Ma'aseh Goy Invalidity: This baraita directly reinforces the Gemara's premise that tefillin (and by extension mezuzot and Sifrei Torah) written by a goy are pasul. This is why tefillin served as a strong kushya against Rav Hisda's principle.
• Bracha Implication: Just as for tefillin, no bracha is recited upon writing a Sefer Torah or mezuzah. The bracha is recited on the kiyum (e.g., hagba'ah and keriah for Sefer Torah, affixing the mezuzah to the doorpost). This aligns perfectly with the Gemara's final terutz in Menachot 42a: these are mitzvot where the asiah (writing) is not the gimur mitzvah (completion of the mitzvah), but rather the preparation of the cheftza. The completion comes with the use or placement of the object. This intertextual connection demonstrates the pervasive nature of the "גמר מצוה" principle in birkat hamitzvot.

Psak/Practice

The sugya in Menachot 42a has direct and significant ramifications for halachic practice, as codified in the Shulchan Aruch and later poskim.

1. Shiur Tzitzit (Minimum Length)

The Gemara's initial discussion establishing "אין לה שיעור למעלה ויש לה שיעור למטה" is halacha l'maaseh.

• Shulchan Aruch Orach Chayim 11:15: "שיעור חוטים תלויים, דהיינו החלק שיוצא מהקשר התחתון ולמטה, צריך שיהיה בו לפחות י"ב גודלים (י"ב אגודלים; י"ב סנטימטרים), או שיהיה בו כדי שיכרוך ויקשור בו שלש קשרים ויהיה נשאר ממנו כפול." (The measure of the hanging strings, meaning the part that extends from the lowest knot downwards, must be at least twelve thumb-lengths [or twelve centimeters], or enough to wrap and tie three knots and still have a doubled portion remaining.) The poskim derive this minimum from the Gemara's "יש לה שיעור למטה" and various drashot. The maximum length is indeed unrestricted.

2. Bracha on Making Tzitzit

The Gemara's complex discussion on birkat ha'asiah leads to a clear psak.

• Shulchan Aruch Orach Chayim 14:3: "העושה ציצית, אינו מברך: 'על עשיית ציצית', אלא כשלובש הטלית מברך: 'להתעטף בציצית'." (One who makes tzitzit does not recite the blessing: 'concerning the making of tzitzit', rather when he wears the tallit he recites: 'to wrap oneself in tzitzit'). This follows the final terutz of the Gemara, adopting Rav Nachman's position that the mitzvah is a chovat gavra completed by wearing, not by making.

3. Tzitzit by a Goy and Lishma

The Gemara's first version of Rav's opinion (gentile-made tzitzit are invalid) and Shmuel's view on lishma are accepted.

• Shulchan Aruch Orach Chayim 14:1: "אין עושים ציצית אלא לשמה, בין חוטים לבנים, בין חוט של תכלת. ואם עשאן עכו"ם, פסולין." (One only makes tzitzit lishma, whether the white strings or the tekhelet string. And if a gentile made them, they are invalid.) This means that the spinning of the threads and the dyeing of the tekhelet must be done lishma. A goy cannot perform this lishma effectively, as they are not commanded in the mitzvah.

4. Tekhelet Testing

The Gemara's discussion on the unreliability of tekhelet testing and the need for an expert leads to strict halacha.

• Shulchan Aruch Orach Chayim 13:1: "אין לסמוך על שום בדיקה לטלית שיש בה תכלת, אלא אם כן קנה אותה ממומחה." (One may not rely on any test for a tallit that has tekhelet, unless he purchased it from an expert.) This underscores the profound difficulty in authenticating tekhelet and the halachic emphasis on chazakot (presumptions) and reliance on trustworthy individuals for mitzvot with complex manufacturing processes.

Takeaway

This sugya profoundly illustrates how the Gemara systematically deconstructs initial assumptions about shiurim and birkat hamitzvot, ultimately establishing nuanced conceptual frameworks. The distinction between a mitzvah's preparation and its ultimate fulfillment, encapsulated in "גמר מצוה," is a cornerstone for understanding birkat ha'asiah and the role of lishma.

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¹ Rashi on Menachot 42a s.v. "אין לה שיעור למעלה". ² Steinsaltz on Menachot 42a s.v. "אין לה שיעור למעלה". ³ Rashi on Menachot 42a s.v. "ויש לה שיעור למטה". ⁴ Rif, Halachot Ketanot (Menachot) 12b.