אורח חיים שע״חOrach Chayim 378

Se’if 1א׳

שָׁלֹשׁ חֲצֵרוֹת פְּתוּחוֹת זוֹ לְזוֹ וּפְתוּחוֹת לִרְשׁוּת הָרַבִּים, וְעֵרְבָה כָּל אַחַת מֵהַחִיצוֹנוֹת עִם הָאֶמְצָעִית, וְהַחִיצוֹנוֹת לֹא עֵרְבוּ יַחַד, הַחִיצוֹנוֹת אֲסוּרוֹת זוֹ עִם זוֹ וְהָאֶמְצָעִית מֻתֶּרֶת עִם כָּל אַחַת מֵהֶן וְהֵן מֻתָּרוֹת עִמָּהּ. בַּמֶּה דְּבָרִים אֲמוּרִים, כְּשֶׁנָּתְנָה אֶמְצָעִית עֵרוּבָהּ בְּזוֹ וְעֵרוּבָהּ בְּזוֹ, אוֹ שֶׁנָּתְנוּ הַחִיצוֹנוֹת עֵרוּבָן בָּאֶמְצָעִית בִּשְׁנֵי בָּתִּים, אֲבָל אִם נָתְנוּ שְׁתֵּי הַחִיצוֹנוֹת עֵרוּבָן בָּאֶמְצָעִית בְּבַיִת אֶחָד, שְׁלָשְׁתָּן מֻתָּרוֹת זוֹ עִם זוֹ.

Laws of courtyards that open into one another. Contains 5 sections Three courtyards opening into one another and opening to a public domain, where each of the outer ones made an eruv with the middle one but the outer ones did not make an eruv with each other — the outer ones are forbidden to each other, the middle one is permitted with each of them, and they are permitted with it. This applies when the middle one placed its eruv in one and its eruv in the other, or when the outer ones placed their eruv in the middle one in two separate houses. But if both outer ones placed their eruv in the middle one in one house, all three are permitted with one another.

Se’if 2ב׳

שְׁתֵּי חֲצֵרוֹת זוֹ לְפָנִים מִזּוֹ, וּפְנִימִית פְּתוּחָה לַחִיצוֹנָה וְהַחִיצוֹנָה לַמָּבוֹי, וְיֵשׁ לַפְּנִימִית דְּרִיסַת רֶגֶל עַל הַחִיצוֹנָה, אִם עֵרְבָה פְּנִימִית לְעַצְמָהּ וְלֹא הַחִיצוֹנָה, אוֹ שֶׁעֵרְבָה כָּל אַחַת לְעַצְמָהּ וְשָׁכַח אֶחָד מִן הַחִיצוֹנָה וְלֹא עֵרֵב, פְּנִימִית מֻתֶּרֶת וְהַחִיצוֹנָה אֲסוּרָה. עֵרְבָה חִיצוֹנָה וְלֹא פְּנִימִית, אוֹ שֶׁעֵרְבָה כָּל אַחַת לְעַצְמָהּ וְשָׁכַח אֶחָד מֵהַפְּנִימִית וְלֹא עֵרֵב, שְׁתֵּיהֶן אֲסוּרוֹת. עֵרְבָה כָּל אַחַת לְעַצְמָהּ, כָּל אַחַת מֻתֶּרֶת בַּחֲצֵרָהּ.

Two courtyards one inside the other, the inner one opening to the outer one and the outer one to an alleyway, and the inner one has foot traffic through the outer one — if the inner one made an eruv on its own and the outer one did not, or if each made its own eruv and one person from the outer one forgot and did not make an eruv — the inner one is permitted and the outer one is forbidden. If the outer one made an eruv and the inner one did not, or if each made its own eruv and one person from the inner one forgot and did not make an eruv — both are forbidden. If each made its own eruv, each is permitted in its own courtyard.

Se’if 3ג׳

עֵרְבוּ בְּיַחַד וְנָתְנוּ עֵרוּבָן בַּחִיצוֹנָה, וְשָׁכַח אֶחָד בֵּין מִן הַפְּנִימִית בֵּין מִן הַחִיצוֹנָה וְלֹא עֵרֵב, שְׁתֵּיהֶן אֲסוּרוֹת עַד שֶׁיְּבַטֵּל רְשׁוּתוֹ. וְאִם נָתְנוּ עֵרוּבָן בַּפְּנִימִית וְשָׁכַח אֶחָד מִן הַפְּנִימִית וְלֹא עֵרֵב, שְׁתֵּיהֶן אֲסוּרוֹת. אֲבָל אִם שָׁכַח אֶחָד מִן הַחִיצוֹנָה וְלֹא עֵרֵב, פְּנִימִית מֻתֶּרֶת.

If they made a joint eruv and placed it in the outer one, and one person — whether from the inner or outer — forgot and did not make an eruv, both are forbidden until he renounces his domain. If they placed their eruv in the inner one and one person from the inner one forgot and did not make an eruv, both are forbidden. But if one person from the outer one forgot and did not make an eruv, the inner one is permitted.