ג אִם הָיוּ רוֹכְבִים, וְאָמְרוּ: נֹאכַל, אַף עַל פִּי שֶׁכָּל אֶחָד אוֹכֵל מִכִּכָּרוֹ וְלֹא יָרְדוּ מֵהַבְּהֵמוֹת, מִצְטָרְפִין כֵּיוָן שֶׁעָמְדוּ בְּמָקוֹם אֶחָד; אֲבָל אִם הָיוּ הוֹלְכִים וְאוֹכְלִים, לֹא; וְאִם הָיוּ אוֹכְלִים בַּשָּׂדֶה מְפֻזָּרִים וּמְפֹרָדִים, אַף עַל פִּי שֶׁאוֹכְלִים כֻּלָּם בְּשָׁעָה אַחַת וּמִכִּכָּר אֶחָד, כֵּיוָן שֶׁלֹּא קָבְעוּ מָקוֹם לֶאֱכֹל אֵינָם מִצְטָרְפִין. הַגָּה: הַמִּנְהָג שֶׁלֹּא לְזַמֵּן בְּבֵית עוֹבֵד כּוֹכָבִים, וְנִרְאֶה לִי הַטַּעַם מִשּׁוּם דְּלֹא יוּכְלוּ לִקְבֹּעַ עַצְמָן בְּבֵית עוֹבֵד כּוֹכָבִים, מִשּׁוּם יִרְאַת הָעוֹבֵד כּוֹכָבִים וְהָוֵי כְּאִלּוּ אָכְלוּ בְּלֹא קֶבַע, וְעוֹד דְּיֵשׁ לָחוּשׁ לְסַכָּנָה אִם יְשַׁנּוּ בְּנֻסַּח הַבְּרָכָה וְלֹא יֹאמְרוּ הָרַחֲמָן יְבָרֵךְ בַּעַל הַבַּיִת הַזֶּה, וְלָכֵן מִתְּחִלָּה לֹא קָבְעוּ עַצְמָן רַק לְבָרֵךְ כָּל א' לְבַדּוֹ, וְלָכֵן אֵין לְשַׁנּוֹת הַמִּנְהָג אַף אִם לֹא הָיוּ טְעָמִים אֵלּוּ מַסְפִּיקִים, מִכָּל מָקוֹם מֵאַחַר דִּכְבָר נָהֲגוּ כָּךְ הָוֵי כְּאִלּוּ לֹא קָבְעוּ עַצְמָן בְּיַחַד.
3 If they were riding and said, “Let us eat,” even if each one eats from his own loaf and they did not dismount from their animals, they are joined (for zimun), since they stayed in one place. But if they were walking and eating — they are not joined. And if they were eating scattered and separated in a field, even if they are all eating at the same time and from the same loaf, since they did not designate a place to eat, they are not joined. Rema: The custom is not to perform a zimun in a non-Jew’s house, and the reason seems to be that they cannot establish themselves (for a meal) in a non-Jew’s house due to fear of the non-Jew, and it is as if they ate without establishing (a meal). Furthermore, there is concern for danger if they alter the wording of the blessing and do not say, “May the Merciful One bless this household.” Therefore, from the outset, they did not establish themselves, but rather each one intended to bless on his own. And thus the custom should not be changed, even if these reasons are not entirely sufficient — nevertheless, since the custom has already been established, it is as if they did not establish themselves together.