בבא בתרא

הַשֻּׁתָּפִין שֶׁרָצוּ לַעֲשׂוֹת מְחִצָּה בֶּחָצֵר, בּוֹנִין אֶת הַכֹּתֶל בָּאֶמְצַע. מְקוֹם שֶׁנָּהֲגוּ לִבְנוֹת גָּוִיל, גָּזִית, כְּפִיסִין, לְבֵנִים, בּוֹנִים, הַכֹּל כְּמִנְהַג הַמְּדִינָה. בְּגָוִיל, זֶה נוֹתֵן שְׁלֹשָׁה טְפָחִים, וְזֶה נוֹתֵן שְׁלֹשָׁה טְפָחִים. בְּגָזִית, זֶה נוֹתֵן טְפָחַיִם וּמֶחֱצָה, וְזֶה נוֹתֵן טְפָחַיִם וּמֶחֱצָה. בִּכְפִיסִין, זֶה נוֹתֵן טְפָחַיִם, וְזֶה נוֹתֵן טְפָחַיִם. בִּלְבֵנִים, זֶה נוֹתֵן טֶפַח וּמֶחֱצָה, וְזֶה נוֹתֵן טֶפַח וּמֶחֱצָה. לְפִיכָךְ אִם נָפַל הַכֹּתֶל, הַמָּקוֹם וְהָאֲבָנִים שֶׁל שְׁנֵיהֶם:

If two partners wish to make a partition in a courtyard they build the wall in the middle. In a place where the custom is to build of unshaped stones, or of hewn stones, or of half-bricks, or of whole bricks, so they should build it everything is according to local custom. [If the wall is made of] unshaped stones this one supplies [from his property] three handbreadths, and this one supplies [from his property] three handbreadths. [If the wall is made of] hewn stones this one supplies [from his property] two and a half handbreadths, and this one supplies [from his property] two and a half handbreadths. [If the wall is made of] half-bricks this one supplies [from his property] two handbreadths, and this one supplies [from his property] two handbreadths. [If the wall is made of] whole bricks this one supplies [from his property] one and a half handbreadths, and this one supplies [from his property] one and a half handbreadths.

וְכֵן בְּגִנָּה, מְקוֹם שֶׁנָּהֲגוּ לִגְדֹּר מְחַיְּבִין אוֹתוֹ. אֲבָל בְּבִקְעָה, מְקוֹם שֶׁנָּהֲגוּ שֶׁלֹּא לִגְדֹּר אֵין מְחַיְּבִין אוֹתוֹ, אֶלָּא אִם רוֹצֶה כּוֹנֵס לְתוֹךְ שֶׁלּוֹ וּבוֹנֶה, וְעוֹשֶׂה חֲזִית מִבַּחוּץ. לְפִיכָךְ אִם נָפַל הַכֹּתֶל, הַמָּקוֹם וְהָאֲבָנִים שֶׁלּוֹ. אִם עָשׂוּ מִדַּעַת שְׁנֵיהֶן, בּוֹנִין אֶת הַכֹּתֶל בָּאֶמְצַע, וְעוֹשִׂין חָזִית מִכָּאן וּמִכָּאן. לְפִיכָךְ אִם נָפַל הַכֹּתֶל, הַמָּקוֹם וְהָאֲבָנִים שֶׁל שְׁנֵיהֶם:

The same is true with a garden: in a place where the custom is to build a fence, they can obligate him to do so. However, in a valley, where it is not customary to build a fence, they cannot obligate him to do so. But if he wants to [build a fence] he must gather into his own portion and build, and he puts a finishing on the outside of the wall. Therefore if the wall falls, the place and the stones belong to him. If they acted with each other’s consent, they should build the wall in the middle and put a finishing on both sides. Therefore if the wall falls, the place and the stones belong to them both.