הלכות עירובין ג׳Eruvin 3

Halacha 1א׳

חַלוֹן שֶׁבֵּין שְׁתֵּי חֲצֵרוֹת אִם יֵשׁ בּוֹ אַרְבָּעָה טְפָחִים עַל אַרְבָּעָה טְפָחִים אוֹ יֶתֶר עַל זֶה וְהָיָה קָרוֹב מִן הָאָרֶץ בְּתוֹךְ עֲשָׂרָה טְפָחִים. אֲפִלּוּ כֻּלּוֹ לְמַעְלָה מֵעֲשָׂרָה וּמִקְצָתוֹ בְּתוֹךְ עֲשָׂרָה אוֹ כֻּלּוֹ בְּתוֹךְ עֲשָׂרָה וּמִקְצָתוֹ לְמַעְלָה מֵעֲשָׂרָה אִם רָצוּ יוֹשְׁבֵי שְׁתֵּי הַחֲצֵרוֹת לְעָרֵב כֻּלָּן עֵרוּב אֶחָד הָרְשׁוּת בְּיָדָן וְיֵעָשׂוּ כְּחָצֵר אַחַת וִיטַלְטְלוּ מִזּוֹ לָזוֹ. וְאִם רָצוּ מְעָרְבִין שְׁנֵי עֵרוּבִין אֵלּוּ לְעַצְמָן וְאֵלּוּ לְעַצְמָן. הָיָה הַחַלּוֹן פָּחוֹת מֵאַרְבָּעָה אוֹ שֶׁהָיָה כֻּלּוֹ לְמַעְלָה מֵעֲשָׂרָה מְעָרְבִין שְׁנֵי עֵרוּבִין אֵלּוּ לְעַצְמָן וְאֵלּוּ לְעַצְמָן:

[In a case of] a window between two courtyards: If it has four handbreadths by four handbreadths or more and it was within ten handbreadths of the ground — even if [almost] all of it was above ten and a little of it was within ten or [almost] all of it was within ten and a little of it above ten — the residents of the two courtyards have permission to make one eruv for all of it and make it into one courtyard so that they can carry from this one to that one, if they wanted. And if they wanted, they could [also] make two eruvs, these for themselves and those for themselves. [But if] the window was less than four or it was all above ten, they may [only] make two eruvs, these for themselves and those for themselves.

Halacha 2ב׳

בַּמֶּה דְּבָרִים אֲמוּרִים בְּחַלּוֹן שֶׁבֵּין שְׁתֵּי חֲצֵרוֹת אֲבָל שֶׁבֵּין שְׁנֵי בָּתִּים אֲפִלּוּ הָיָה לְמַעְלָה מֵעֲשָׂרָה. וְכֵן חַלּוֹן שֶׁבֵּין בַּיִת לָעֲלִיָּה אִם רָצוּ מְעָרְבִין עֵרוּב אֶחָד אֲפִלּוּ שֶׁאֵין בֵּינֵיהֶם סֻלָּם. וְהוּא שֶׁיִּהְיֶה בּוֹ אַרְבָּעָה עַל אַרְבָּעָה. הָיָה חַלּוֹן עָגֹל אִם יֵשׁ בּוֹ כְּדֵי לְרַבֵּעַ בּוֹ אַרְבָּעָה עַל אַרְבָּעָה הֲרֵי הוּא כִּמְרֻבָּע:

To what are these words applicable? To a window that is between two courtyards. But [in the case of a window] between two houses, even if it is above ten — and likewise a window between a house and an attic — they may make one eruv, even though there is no ladder between them. And that is when it has four by four. [If] the window was round — if there is enough to square it to be four by four, it is certainly like [such a] square.

Halacha 3ג׳

כֹּתֶל שֶׁבֵּין שְׁתֵּי חֲצֵרוֹת אוֹ מַתְבֵּן שֶׁבֵּין שְׁתֵּי חֲצֵרוֹת פָּחוֹת מֵעֲשָׂרָה טְפָחִים מְעָרְבִין עֵרוּב אֶחָד וְאֵין מְעָרְבִין שְׁנַיִם. הָיָה גָּבוֹהַּ עֲשָׂרָה אוֹ יֶתֶר עַל כֵּן מְעָרְבִין שְׁנֵי עֵרוּבִין אֵלּוּ לְעַצְמָן וְאֵלּוּ לְעַצְמָן. וְאִם הָיָה בֵּינֵיהֶם סֻלָּם מִכָּאן וְסֻלָּם מִכָּאן הֲרֵי הֵן כְּפֶתַח. וְאִם רָצוּ מְעָרְבִין אֶחָד. וַאֲפִלּוּ הָיָה הַסֻּלָּם זָקוּף וְסָמוּךְ לַכֹּתֶל שֶׁהֲרֵי אֵין יְכוֹלִין לַעֲלוֹת בּוֹ עַד שֶׁיִּמָּשֵׁךְ וְיִתְרַחֵק מִתַּחְתָּיו מִן הַכֹּתֶל הֲרֵי זֶה מַתִּיר. וַאֲפִלּוּ לֹא הָיָה מַגִּיעַ רֹאשׁ הַסֻּלָּם לְרֹאשׁ הַכֹּתֶל אִם נִשְׁאַר בֵּינֵיהֶן פָּחוֹת מִשְּׁלֹשָׁה הֲרֵי זֶה מַתִּיר וּמְעָרְבִין אֶחָד אִם רָצוּ:

[In the case of] a wall or a haystack that is between two courtyards: [If] it is less than ten handbreadths, we may make one eruv, but we may not make two eruvs. If it is ten or more high, we may [only] make two eruvs, these for themselves and those for themselves. However if there was a ladder from here and a ladder from there between them, it is surely like an entrance. So they may [also] make one eruv, if they wanted. And even [if] the ladder was straight and [immediately] adjacent to the wall, such that we surely cannot climb on it until it is pulled back and distanced from the wall, it certainly permits [it]. And even [if] the top of the ladder did not reach the top of the wall — if there was less than three handbreadths left between them — it certainly permits [it], and they may [also] make one eruv, if they wanted.