Eruvin 16a

בַּעֲבִיטִין, בִּשְׁלִיפִין, בְּקָנִים, בְּקוֹלָחוֹת — מְטַלְטְלִין בְּתוֹכָהּ, וּבִלְבַד שֶׁלֹּא יְהֵא בֵּין גָּמָל לְגָמָל כִּמְלֹא גָּמָל, וּבֵין אוּכָּף לְאוּכָּף כִּמְלֹא אוּכָּף, וּבֵין עָבִיט לְעָבִיט כִּמְלֹא עָבִיט!

or with saddle cushions [ avitin ], or with wheat sheaves, or with boards, or with stalks [ kolaḥot ], one may carry within the enclosed area, provided that there is no camel-length gap between one camel and another, or a saddle-length gap between one saddle and another, or a cushion-length gap between one cushion and another. Apparently, from this baraita it can be understood that if the breach is equal to the standing segment, it is not a valid enclosure.

הָכָא נָמֵי כְּשֶׁנִּכְנָס וְיוֹצֵא.

The Gemara rejects this conclusion. Here, too, it is referring to gaps through which the various objects can easily be inserted and extracted, so that the breached segment is in fact slightly greater than that of the standing segment.

תָּא שְׁמַע: נִמְצֵאתָ אַתָּה אוֹמֵר, שָׁלֹשׁ מִדּוֹת בִּמְחִיצוֹת: כֹּל שֶׁהוּא פָּחוֹת מִשְּׁלֹשָׁה, צָרִיךְ שֶׁלֹּא יְהֵא בֵּין זֶה לָזֶה שְׁלֹשָׁה, כְּדֵי שֶׁלֹּא יִזְדַּקֵּר הַגְּדִי בְּבַת רֹאשׁ.

The Gemara cites yet another proof: Come and hear that which was taught in the Tosefta in tractate Kilayim : Ultimately, you say that there are three measures for partitions. These partitions form a barrier that demarcates between vines and seeds. They are needed to render permitted the sowing of a field with diverse kinds of seeds. In the case of any partition consisting of boards that are each less than three handbreadths wide, it is necessary that there will not be a gap of three handbreadths between this board and that, so that a goat would not be able to leap headlong through it unimpeded. If the gap is wider than three handbreadths, i.e., wide enough that a goat can leap through it, the boards are not considered joined and it is not considered a partition.

כֹּל שֶׁהוּא שְׁלֹשָׁה, וּמִשְּׁלֹשָׁה עַד אַרְבָּעָה, צָרִיךְ שֶׁלֹּא יְהֵא בֵּין זֶה לָזֶה כִּמְלוֹאוֹ, כְּדֵי שֶׁלֹּא יְהֵא פָּרוּץ כְּעוֹמֵד. וְאִם הָיָה פָּרוּץ מְרוּבֶּה עַל הָעוֹמֵד — אַף כְּנֶגֶד הָעוֹמֵד אָסוּר.

In the case of any partition that consists of boards that are three handbreadths wide, as well as boards from three to four handbreadths wide, the gap between the boards may be greater than three handbreadths. Nonetheless, it is necessary that there will not be a gap equal to the full width of a board between one board and the next, so that the breached segment will not equal the standing segment. And if the breached segment is greater than the standing segment, it is prohibited to sow another species, even in the area opposite the standing segment, as the breached segment invalidates the entire partition.

כֹּל שֶׁהוּא אַרְבָּעָה, וּמֵאַרְבָּעָה עַד עֶשֶׂר אַמּוֹת, צָרִיךְ שֶׁלֹּא יְהֵא בֵּין זֶה לָזֶה כִּמְלוֹאוֹ, שֶׁלֹּא יְהֵא פָּרוּץ כְּעוֹמֵד. וְאִם הָיָה פָּרוּץ כְּעוֹמֵד, כְּנֶגֶד הָעוֹמֵד — מוּתָּר, כְּנֶגֶד הַפָּרוּץ — אָסוּר. וְאִם הָיָה עוֹמֵד מְרוּבֶּה עַל הַפָּרוּץ — אַף כְּנֶגֶד הַפָּרוּץ מוּתָּר.

With regard to any partition that consists of boards that are four handbreadths wide, as well as boards from four handbreadths to ten cubits wide, it is necessary that there not be a gap the full width of a board between one board and the next, so that the breached segment will not equal the standing segment. And if the breached segment equals the standing segment, then in the area opposite the standing segment, it is permitted to sow other species, as there is a partition there; however, in the area facing the breached segment it is prohibited. And if the sum of the standing segments is greater than the sum of the breached segments, sowing other species is permitted, even in the area opposite the breached part.

נִפְרְצָה בְּיוֹתֵר מֵעֶשֶׂר — אָסוּר, הָיוּ שָׁם קָנִים הַדּוֹקְרָנִים וְעוֹשֶׂה לָהֶן פֵּיאָה מִלְמַעְלָה, אֲפִילּוּ בְּיוֹתֵר מֵעֶשֶׂר מוּתָּר.

However, if, the partition was breached more than ten cubits, sowing diverse kinds is prohibited, as a breach of more than ten cubits invalidates the entire partition. But if there were pronged stakes stuck in the ground there, and one made them a braid [ pe’a ] of straw above them in the form of a doorway, even if the stakes were set more than ten cubits apart, sowing is permitted. The form of a doorway renders the partition valid, even if there is a breach wider than ten cubits.

קָתָנֵי מִיהַת רֵישָׁא מִשְּׁלֹשָׁה עַד אַרְבָּעָה, וּבִלְבַד שֶׁלֹּא יְהֵא בֵּין זֶה לָזֶה כִּמְלוֹאוֹ, תְּיוּבְתָּא דְּרַב פָּפָּא!

The Gemara explains how the passage from the Tosefta of tractate Kilayim supports the opinion of Rav Huna, son of Rav Yehoshua, contrary to that of Rav Pappa. In any case, the first clause of the Tosefta teaches that if each of the boards that make up the partition is from three to four handbreadths wide, sowing other species is permitted, provided that there is not a gap the full width of a board between one board and the next. This is a conclusive refutation of the opinion of Rav Pappa, who permits carrying when the breach equals the standing segment of the partition.

אָמַר לְךָ רַב פָּפָּא: מַאי מְלוֹאוֹ — נִכְנָס וְיוֹצֵא.

Rav Pappa could have said to you: What does the baraita mean by a gap the full width of a board? It means a gap through which the board could easily be inserted and extracted, which is a gap slightly wider than the board itself.

הָכִי נָמֵי מִסְתַּבְּרָא מִדְּקָתָנֵי: אִם הָיָה פָּרוּץ מְרוּבֶּה עַל הָעוֹמֵד — אַף כְּנֶגֶד הָעוֹמֵד אָסוּר. הָא כְּעוֹמֵד — מוּתָּר. שְׁמַע מִינַּהּ.

The Gemara comments: So too, it stands to reason, from the fact that the Tosefta teaches later: If the breached segment is greater than the standing segment, it is prohibited to sow another species, even in the area opposite the standing portion. By inference, if the breached segment equals the standing segment, sowing other species is in fact permitted. The Gemara concludes: Indeed, learn from here proof for the opinion of Rav Pappa.

לֵימָא תֶּיהְוֵי תְּיוּבְתֵּיהּ דְּרַב הוּנָא בְּרֵיהּ דְּרַב יְהוֹשֻׁעַ? אָמַר לָךְ: וְלִיטַעְמָיךְ, אֵימָא סֵיפָא: אִם הָיָה עוֹמֵד מְרוּבֶּה עַל הַפָּרוּץ, אַף כְּנֶגֶד הַפָּרוּץ מוּתָּר. הָא כַּפָּרוּץ — אָסוּר!

The Gemara asks: Let us say that this conclusion is a conclusive refutation of the opinion of Rav Huna, son of Rav Yehoshua. The Gemara rejects this: Rav Huna, son of Rav Yehoshua, could have said to you: And according to your reasoning, say the latter clause of the Tosefta as follows: If the sum of the standing segment is greater than the sum of the breached segment, sowing other species is permitted even in the area opposite the breached segment. This clause indicates that if the breached segment equals the standing segment, sowing other species is prohibited.

סֵיפָא קַשְׁיָא לְרַב פָּפָּא, רֵישָׁא קַשְׁיָא לְרַב הוּנָא בְּרֵיהּ דְּרַב יְהוֹשֻׁעַ.

The Gemara points out that that analysis of the baraita leads to the conclusion that the latter clause poses a difficulty for Rav Pappa’s opinion; the first clause poses a difficulty for the opinion of Rav Huna, son of Rav Yehoshua.

סֵיפָא לְרַב פָּפָּא לָא קַשְׁיָא: אַיְּידֵי דִּתְנָא רֵישָׁא ״פָּרוּץ מְרוּבֶּה עַל הָעוֹמֵד״, תְּנָא סֵיפָא ״עוֹמֵד מְרוּבֶּה עַל הַפָּרוּץ״.

The Gemara answers: The latter clause poses no difficulty to Rav Pappa. Since the first clause taught the expression: If the sum of the breached segment is greater than the sum of the standing segment, the latter clause of the baraita taught the parallel expression: If the sum of the standing segment is greater than the sum of the breached segment, even though the latter formulation is imprecise, as the same halakha applies even if the two are equal.

רֵישָׁא לְרַב הוּנָא בְּרֵיהּ דְּרַב יְהוֹשֻׁעַ לָא קַשְׁיָא: אַיְּידֵי דְבָעֵי לְמִיתְנֵי סֵיפָא ״עוֹמֵד מְרוּבֶּה עַל הַפָּרוּץ״, תְּנָא רֵישָׁא ״פָּרוּץ מְרוּבֶּה עַל הָעוֹמֵד״.

Similarly, the Gemara explains that the first clause does not pose a difficulty to Rav Huna, son of Rav Yehoshua. Since the baraita sought to teach the expression in the latter clause: If the sum of the standing segments is greater than the sum of the breached segments, in the first clause taught the parallel expression: If the sum of the breached segments is greater than the sum of the standing segments, even though this formulation is imprecise, as the same halakha applies even if the two are equal.

בִּשְׁלָמָא לְרַב פָּפָּא, מִשּׁוּם הָכִי לָא עָרֵיב לְהוּ וְתָנֵי לְהוּ.

The Gemara continues: Granted, according to Rav Pappa, who permits carrying in the case where the breaches equal the standing segments, the baraita makes sense, as for that reason the tanna did not combine the case of boards less than three handbreadths wide with the case of boards three handbreadths wide and teach them in a single clause. According to Rav Pappa, there is a significant difference between the two situations. In a case where the boards are less than three handbreadths wide, the partition is invalid if there is a gap of three handbreadths between one bar and the next. However, if the boards are precisely three handbreadths wide, the partition is valid unless there is a gap of more than three handbreadths between them.

אֶלָּא לְרַב הוּנָא בְּרֵיהּ דְּרַב יְהוֹשֻׁעַ — לִיעָרְבִינְהוּ וְלִיתְנִנְהוּ: כׇּל שֶׁהוּא פָּחוֹת מִשְּׁלֹשָׁה, וּשְׁלֹשָׁה — צָרִיךְ שֶׁלֹּא יְהֵא בֵּין זֶה לָזֶה שְׁלֹשָׁה!

However, according to Rav Huna, son of Rav Yehoshua, who considers a partition invalid when its breached segments are equal to its standing segments, the baraita should have combined the case of boards less than three handbreadths wide with the case of boards exactly three handbreadths wide and taught them in the following single clause: Any partition made of boards less than three handbreadths wide or exactly three handbreadths wide, it is necessary that there not be a gap of three handbreadths between one board and another. According to Rav Huna, son of Rav Yehoshua, if a partition with boards three handbreadths wide is to be valid, the gap must be less than three handbreadths.

מִשּׁוּם דְּלָא דָּמֵי פְּסוּלָא דְרֵישָׁא לִפְסוּלָא דְסֵיפָא. פְּסוּלָא דְרֵישָׁא — כְּדֵי שֶׁלֹּא יִזְדַּקֵּר הַגְּדִי בְּבַת אַחַת, פִּסּוּלָא דְסֵיפָא — שֶׁלֹּא יְהֵא פָּרוּץ כָּעוֹמֵד.

The Gemara explains why the two cases were not combined according to Rav Huna, son of Rav Yehoshua. It is because the disqualification in the first clause is not similar to the disqualification in the latter clause. The reason for the disqualification in the first clause is because a valid partition must be constructed so that a goat would not be able to jump through the gap in one leap; the reason for the disqualification in the latter clause, where the boards are three handbreadths wide, is so that the breached segments will equal the combined standing segments. In practice, just as in the case of boards less than three handbreadths wide, the gap must be less than three handbreadths, so too, in the case of boards three handbreadths wide, the gap must also be less than three handbreadths. However, in terms of underlying reasoning, the case of boards three handbreadths wide must be categorized in the second grouping in the Tosefta , not the first. Therefore, no proof can be cited from here, neither in support of the opinion of Rav Pappa nor in support of the opinion of Rav Huna, son of Rav Yehoshua.

פָּחוֹת מִשְּׁלֹשָׁה מַנִּי — רַבָּנַן הִיא, דְּאָמְרִי: פָּחוֹת מִשְּׁלֹשָׁה אָמְרִינַן לָבוּד, שְׁלֹשָׁה לָא אָמְרִינַן לָבוּד.

The Gemara briefly discusses the ruling cited in the Tosefta that a breach of less than three handbreadths does not invalidate a partition. In accordance with whose opinion is that ruling? It is in accordance with the opinion of the Rabbis, who say: In the case of a gap less than three handbreadths, we say, i.e., we apply, the principle of lavud , and the partitions are considered joined; however, if the gap is three handbreadths, we do not say lavud .

אֵימָא סֵיפָא: כׇּל שֶׁהוּא שְׁלֹשָׁה, וּמִשְּׁלֹשָׁה וְעַד אַרְבָּעָה —

Say the latter clause with regard to a partition of boards as follows: In the case of any partition whose boards are three handbreadths wide, and any partition whose boards are from three to four handbreadths wide,