The discussion opens with a case from the tractate Shevuot, detailing an encounter between the rabbis Ifa and Avimi. Ifa, who studied tractate Shevuot in the academy of Rabba, was asked by his brother Avimi about a specific scenario: "What is the ruling if a man makes a double oath, saying 'I swear I will not eat this item,' and then repeats, 'I swear I will not eat this item,' and subsequently eats it?" Avimi's initial thought was that the man would be liable for only one sacrifice, based on the general principle that "an oath does not take effect upon an existing oath." Since the item was already forbidden by the first oath, the second oath seemed superfluous.
However, Ifa corrected him, stating that Avimi had made a mistake in his understanding. Ifa explained that the moment the first oath, "I swear I did not eat it," was uttered, it referred to a past action. If the person had already eaten the item, he immediately transgressed by making a false oath. Therefore, the second identical oath, also referring to the past, would constitute a separate transgression. The principle of "an oath does not take effect upon an existing oath" applies only to future actions, where an item is already forbidden, and a subsequent oath to forbid it further would be meaningless. But in the case of a past action, each utterance of a false oath is a distinct transgression.
Rashi clarifies this point: Avimi's error was in applying the rule of "an oath does not take effect upon an existing oath" to a past-tense oath. The moment the first oath, "I swear I did not eat," left his mouth, if he had already eaten, he immediately incurred liability for a false oath. The second oath, though identical, was a new false statement about a past event, thus incurring a second liability. This differs from an oath concerning a future action, such as "I swear I will not eat this," where the item is already forbidden by the first oath, rendering a second oath on the same item ineffective.
Avimi then presented a second scenario to Ifa: "What if a man swears, 'I will not eat nine figs,' and then swears again, 'I will not eat ten figs,' and subsequently eats ten figs? How many sacrifices is he liable for?" Ifa responded that the man would be liable for two sacrifices, one for each oath. His reasoning was that the first oath only covered nine figs, while the second oath added the tenth fig, making it a new, distinct prohibition. Therefore, the second oath had a new scope and could take effect.
Again, Ifa corrected Avimi, declaring his understanding mistaken. Ifa explained that if one vows not to eat nine figs, this implicitly includes not eating ten figs, as one cannot reach ten without first consuming nine. Therefore, the prohibition against eating ten figs was already encompassed within the first oath. When the man made the second oath not to eat ten figs, he was not adding any new prohibition, as eating ten was already forbidden by the first oath. Consequently, he would be liable for only one sacrifice, as the second oath did not add anything new to the existing prohibition.
Rashi further elucidates Avimi's initial mistake: he thought the second oath was not included in the first. However, by swearing not to eat nine, one automatically vows not to eat ten. Therefore, the second oath was redundant and did not create a new liability. The principle of "an oath does not take effect upon an existing oath" applies here, as the second oath did not add any new item to the prohibition.
Avimi then posed a third question: "What if a man swears, 'I will not eat ten figs,' and then swears, 'I will not eat nine figs,' and eats nine figs? How many sacrifices is he liable for?" Ifa, consistent with his previous reasoning, replied that the man would be liable for only one sacrifice. His logic was that once the man swore not to eat ten figs, this prohibition already encompassed not eating nine figs. Therefore, the subsequent oath not to eat nine figs did not add any new prohibition.
However, Ifa once again corrected Avimi, stating that he was mistaken. Ifa explained that if one vows not to eat ten figs, this *allows* one to eat up to nine figs. The first oath only prohibits the consumption of ten or more. The second oath, "I will not eat nine figs," *limits* this permission, making the consumption of nine figs now forbidden. This constitutes an *addition* to the original prohibition, not a repetition. Therefore, the man would be liable for two sacrifices: one for violating the oath not to eat ten (by eating the tenth fig) and one for violating the oath not to eat nine (by eating the ninth fig). Rashi clarifies that in this case, the second oath is not a mere repetition because it adds a new restriction. If the man eats nine figs, he transgresses the second oath. If he then eats the tenth, he transgresses the first. These are two distinct liabilities.
The discussion then explores a nuance where Ifa's initial reasoning (one sacrifice for ten then nine) might hold true. This would be in a scenario where the second oath is truly an addition, but the penalty for the first is already "handled." For example, if a man swears, "I will not eat pomegranates," and then swears, "I will not eat figs alone." The first oath means he is liable only if he eats both figs and pomegranates. If he eats figs alone, he is not liable under the first oath. The second oath, however, specifically prohibits eating figs alone. This second oath adds a new prohibition. If he eats figs alone, he is liable for the second oath. If he then eats pomegranates, he is liable for the first oath (for eating both). The novelty here is that the second oath creates a new liability for eating figs alone.
The scenario is further elaborated: if he eats figs unintentionally, he transgresses the second oath and designates a sacrifice. If he then eats pomegranates, he has now eaten both figs and pomegranates, which would normally make him liable for the first oath. However, since he already designated a sacrifice for the figs (for the second oath), the figs are considered "handled." Eating the pomegranates alone now constitutes only "half a measure" of the original combination required for the first oath. A "half measure" does not incur liability for a sacrifice. Thus, he would only bring one sacrifice in this specific case, because the initial component of the first oath (figs) was already accounted for by the second oath and its designated sacrifice.
This same logic can be applied to the "ten figs then nine figs" case. If the man ate nine figs, he transgressed the second oath and designated a sacrifice. The nine figs are now considered "handled." If he then eats the tenth fig, it is considered a "half measure" of the original ten-fig prohibition, as the nine are already accounted for. Therefore, he would only bring one sacrifice in this specific scenario where a sacrifice was designated after the first transgression. This demonstrates that even in cases of multiple oaths, specific circumstances can limit the liability to a single sacrifice.
The discussion shifts to different categories of oaths, beginning with Shavuot Shav. This refers to a vain or worthless oath, specifically when one swears to change something that is obvious or impossible. Examples include swearing that a rock is gold, that a man is a woman, or that one saw a camel flying in the air. Such an oath is considered void, and no sacrifice is brought for its transgression. Another type of Shavuot Shav is swearing to nullify a commandment, such as swearing not to sit in a Sukkah or not to shake the Lulav. Since one cannot nullify a divine commandment, such an oath is void.
Next, the discussion considers two oaths made simultaneously: "I swear I will eat this bread" and "I swear I will not eat this bread." The first oath is a Shavuot Bituy Sfatayim (an oath of utterance). The second oath, however, is a Shavuot Shav because it contradicts the first oath, which made eating the bread a commandment (a positive obligation). One cannot swear to nullify a commandment. Therefore, the second oath is void from the outset.
The Mishnah presents a case where one makes these two contradictory oaths. If he eats the bread, he fulfills the first oath (to eat it) but transgresses the second (not to eat it). Since the second oath is a Shavuot Shav, he is not liable for a sacrifice. If he does not eat the bread, he transgresses the first oath (to eat it), which is a Shavuot Bituy Sfatayim, and is therefore liable for a sacrifice. The Gemara questions this, arguing that the moment the second oath (not to eat) was uttered, it was already a Shavuot Shav, regardless of whether he later ate or not, because it contradicted the first oath. Thus, he should be considered to have transgressed the Shavuot Shav immediately upon utterance, and no sacrifice should be brought.
The Gemara then delves into the definition of "obvious" for a Shavuot Shav. It must be obvious to at least three people that the sworn statement is false (e.g., a man is a man, not a woman). Regarding the example of "I swear I did not see a camel flying in the sky," the Mishnah's wording is peculiar. It implies he is swearing to *not* have seen an impossible thing, which would be true. The Gemara suggests rephrasing the Mishnah to "I swear that I saw a camel flying in the sky," which would then be a false oath about an impossible event. However, it raises the question: perhaps when one says "a camel flying in the sky," he doesn't mean it literally but rather a very large bird, as people sometimes speak loosely. If so, he might not be liable, as one usually follows the intent of the speaker.
This leads to a discussion about oaths in a Bet Din (Jewish court). When a person swears in a Bet Din, the court explicitly states that the oath is taken according to *their* understanding, not the individual's private interpretation. This is to prevent tricks. For instance, if a litigant claims, "I paid him money," and privately means he gave him a piece of wood (called "Zuzah" in some contexts, also a term for money), the court clarifies that "money" means actual currency. This special instruction in Bet Din implies that, generally, outside of court, an oath *does* follow the speaker's intent. Therefore, regarding the flying camel, if the general rule is to follow intent, why would he be liable if he meant a large bird?
The Gemara responds by citing a famous story involving Ravaz. A man owed money and, before his court appearance, gave his litigant a hollow stick containing the money, asking him to hold it. In court, when asked to swear if he had paid, the man swore, "I paid him," referring to the money in the stick. To prevent such deception, the court clarifies that the oath is understood literally, not according to the trickster's private intent. Thus, "money" means actual currency, not a stick containing money. This demonstrates that while the default is to consider intent, specific circumstances (like a Bet Din or an obvious impossibility) override it.
Further proof that oaths are generally interpreted according to the speaker's intent comes from Moshe Rabbeinu's oath to the Jewish people when they accepted the Torah. He told them, "Know that I am making you swear not according to your understanding, but according to the understanding of Borei Olam (the Creator of the World) and my understanding." The Gemara asks why Moshe Rabbeinu needed this explicit clarification. Why couldn't he simply have told them to say, "We accept what God said"? The answer is that the word "God" (Eloah) could be misinterpreted by them to refer to Avodah Zarah (idolatry). This necessity for Moshe Rabbeinu to specify the intent demonstrates that, generally, people's oaths are interpreted according to their own thoughts. Had it not been for the potential misinterpretation, Moshe Rabbeinu would not have needed to add the clarification.
The Gemara explores other phrases Moshe Rabbeinu could have used. "Accept the Torah" wouldn't work, as "Torah" could be understood as "laws," and they might think of two laws (e.g., written and oral Torah) or even laws of Avodah Zarah. "Accept all the commandments" (Kol HaMitzvot) also wouldn't work, as "all the commandments" could be interpreted as referring only to the commandment of Tzitzit, which is considered equivalent to all commandments. This interpretation is based on a verse that links Tzitzit to remembering all commandments, and its numerical value (Gematriah) of 613 (8 strings + 5 knots + 600) equals the total number of commandments. Therefore, Moshe Rabbeinu had to be explicit about the intent, because otherwise, their internal thoughts could lead to misinterpretations, proving that generally, intent matters.
The Gemara then asks why Moshe Rabbeinu didn't simply tell them to say, "We accept 613 commandments." This phrase is unambiguous and leaves no room for misinterpretation. If such a clear phrase existed, he wouldn't have needed to add "according to my understanding, according to God's understanding." This implies that the need for "according to my understanding" was precisely because of the potential for misinterpretation in other phrases. The Gemara further refines this: Moshe Rabbeinu said "according to my understanding *and* according to God's understanding" to make the oath unbreakable. An oath made according to the understanding of many (e.g., Moshe Rabbeinu and HaKadosh Baruch Hu) cannot be annulled. This means that while generally intent is followed, in specific cases, such as in Bet Din or for the acceptance of Torah, strict adherence to the literal meaning or a higher understanding is imposed to prevent evasion.
Returning to the Shavuot Shav case of the flying camel, the conclusion is that the man is liable because the literal words are impossible, regardless of his private intent. Similarly, if someone swears they saw a snake the size of an olive press stone, it is a Shavuot Shav because such a snake is impossible. Even if one argues that the snake might have cracks like the stone, making the comparison about its skin, the Gemara refutes this by noting that such cracks (spots) are only found on the neck of a snake, not its back, making the description impossible.
Revisiting the Mishnah's case of "I swear I will eat this bread" and "I swear I will not eat it." The first oath is a Shavuot Bituy Sfatayim, and the second is a Shavuot Shav. If he eats it, he fulfills the first and transgresses the second. If he doesn't eat it, he transgresses the first. The Gemara maintains that the second oath is a Shavuot Shav the moment it is uttered, regardless of subsequent action, because it contradicts an existing obligation. Therefore, the person is liable for the Shavuot Bituy Sfatayim if he doesn't eat, and for nothing if he eats, as the second oath is void.
The discussion then turns to the scope of Shavuot Bituy Sfatayim. This type of oath applies to men and women, distant relatives and close relatives, fit individuals and unfit individuals, and can be made in a Bet Din or outside a Bet Din. It applies whether one makes the oath oneself or is compelled by others. The Mishnah specifically states that if others compel one to swear, one is not liable unless it is done in a Bet Din. However, if one makes the oath oneself, it applies anywhere.
A Baraitha seemingly contradicts this, stating that for Shavuot Ta'idut (an oath of testimony), if witnesses are told, "Come and testify for me," and they reply, "We swear we don't know testimony," and then someone says, "Do you swear?" and they say "Amen," they are liable even if it's outside a Bet Din. This contradicts the Mishnah's implication that being compelled by others only incurs liability in a Bet Din. The resolution is that if one answers "Amen," it is considered as if one made the oath oneself, and therefore, it is valid even outside a Bet Din. If one does not say "Amen," then it is considered being compelled by others, and it is only valid in a Bet Din.
This distinction is further supported by a precise inference from our Mishnah regarding Shavuot Bituy Sfatayim. The Mishnah states that if one makes the oath "from himself," it applies both in and out of Bet Din. The implication is that if "others" make one swear, it *only* applies in Bet Din. However, the end of the Mishnah states that for both Shavuot Bituy Sfatayim and Shavuot Shav, if one is compelled by others, one is liable regardless of the location. Shmuel resolves this apparent contradiction by explaining that the latter statement refers to a case where one answers "Amen." When one says "Amen" after being asked to swear, it is as if one made the oath oneself, making it valid even outside a Bet Din. Rashi emphasizes that the "Amen" is crucial; without it, the oath is only valid if made in a Bet Din when compelled by others.