ברכות ז׳Berakhot 7

Mishnah 1א׳

שְׁלשָׁה שֶׁאָכְלוּ כְאֶחָד, חַיָּבִין לְזַמֵּן. אָכַל דְּמַאי, וּמַעֲשֵׂר רִאשׁוֹן שֶׁנִּטְּלָה תְרוּמָתוֹ, וּמַעֲשֵׂר שֵׁנִי וְהֶקְדֵּשׁ שֶׁנִּפְדּוּ, וְהַשַּׁמָּשׁ שֶׁאָכַל כַּזַּיִת, וְהַכּוּתִי, מְזַמְּנִין עֲלֵיהֶם. אֲבָל אָכַל טֶבֶל, וּמַעֲשֵׂר רִאשׁוֹן שֶׁלֹּא נִטְּלָה תְרוּמָתוֹ, וּמַעֲשֵׂר שֵׁנִי וְהֶקְדֵּשׁ שֶׁלֹּא נִפְדּוּ, וְהַשַּׁמָּשׁ שֶׁאָכַל פָּחוֹת מִכַּזַּיִת, וְהַנָּכְרִי, אֵין מְזַמְּנִין עֲלֵיהֶם:

If three people eat together they are obligated to convene [to say the blessing after a meal]. If he ate food which may not have been tithed, or the first tithe from which Terumah [produce consecrated for priestly consumption] had been removed, or the second tithe or Hekdesh [items pledged for sacred use] that had been redeemed, or a servant that had eaten an olive['s volume], or a Kuti [sect closely tied to Judaism], he must convene with them. But if he ate untithed produce, or the first tithe from which Terumah had not been removed, or the second tithe or sanctified [food] which had not been redeemed, or a servant who ate less than an olive['s volume], or a non-Jew, he cannot convene with them.

Mishnah 2ב׳

נָשִׁים וַעֲבָדִים וּקְטַנִּים, אֵין מְזַמְּנִין עֲלֵיהֶם. עַד כַּמָּה מְזַמְּנִין, עַד כַּזָּיִת. רַבִּי יְהוּדָה אוֹמֵר, עַד כַּבֵּיצָה:

Women, slaves, and children--one cannot convene with them. How much is needed [to be eaten in order] to convene? At least an olive['s volume]. Rabbi Yehuda says at least an egg['s volume].

Mishnah 3ג׳

כֵּיצַד מְזַמְּנִין, בִּשְׁלשָׁה אוֹמֵר נְבָרֵךְ. בִּשְׁלשָׁה וְהוּא, אוֹמֵר בָּרְכוּ. בַּעֲשָׂרָה, אוֹמֵר נְבָרֵךְ לֵאלֹהֵינוּ. בַּעֲשָׂרָה וָהוּא, אוֹמֵר בָּרְכוּ. אֶחָד עֲשָׂרָה וְאֶחָד עֲשָׂרָה רִבּוֹא. בְּמֵאָה אוֹמֵר, נְבָרֵךְ לַייָ אֱלֹהֵינוּ. בְּמֵאָה וְהוּא, אוֹמֵר בָּרְכוּ. בְּאֶלֶף, אוֹמֵר נְבָרֵךְ לַייָ אֱלֹהֵינוּ אֱלֹהֵי יִשְׂרָאֵל. בְּאֶלֶף וְהוּא, אוֹמֵר בָּרְכוּ. בְּרִבּוֹא, אוֹמֵר, נְבָרֵךְ לַייָ אֱלֹהֵינוּ אֱלֹהֵי יִשְׂרָאֵל אֱלֹהֵי הַצְּבָאוֹת יוֹשֵׁב הַכְּרוּבִים עַל הַמָּזוֹן שֶׁאָכָלְנוּ. בְּרִבּוֹא וְהוּא, אוֹמֵר בָּרְכוּ. כְּעִנְיָן שֶׁהוּא מְבָרֵךְ, כָּךְ עוֹנִין אַחֲרָיו, בָּרוּךְ יְיָ אֱלֹהֵינוּ אֱלֹהֵי יִשְׂרָאֵל אֱלֹהֵי הַצְּבָאוֹת יוֹשֵׁב הַכְּרוּבִים עַל הַמָּזוֹן שֶׁאָכָלְנוּ. רַבִּי יוֹסֵי הַגְּלִילִי אוֹמֵר, לְפִי רֹב הַקָּהָל הֵן מְבָרְכִין, שֶׁנֶּאֱמַר בְּמַקְהֵלוֹת בָּרְכוּ אֱלֹהִים, יְיָ מִמְּקוֹר יִשְׂרָאֵל (תהלים סח). אָמַר רַבִּי עֲקִיבָא, מַה מָּצִינוּ בְּבֵית הַכְּנֶסֶת, אֶחָד מְרֻבִּין וְאֶחָד מֻעָטִין אוֹמֵר, בָּרְכוּ אֶת יְיָ. רַבִּי יִשְׁמָעֵאל אוֹמֵר, בָּרְכוּ אֶת יְיָ הַמְבֹרָךְ:

How does one convene? When there are three [people] say, “Let us bless.” When there are three and him say, “Bless.” When there are ten say, “Let us bless our God.” When there are ten and him say, “Bless”. The [law is the] same for ten as for ten myriads. When there are a hundred say, “Let us bless.” When there are a hundred and him say, “Bless.” When there are a thousand say, “Let us bless God, our God, God of Israel.” When there are a thousand and him say, “Bless”. When there are ten thousand say, “Let us bless God, our God, God of Israel, God of the legions, who dwells above the Keruvim [sculpted creatures that stood above the Ark], for the food that we have eaten.” With ten thousand and himself say, "Bless." Like the way he blessed, they respond after him, “Blessed is God, our God, God of Israel, God of the legions, who dwells above the Keruvim, for the food that we have eaten.” Rabbi Yosi the Galilean says, according to the greatness of the assembly they bless, as it says, ‘In assemblies bless God from the fountain of Israel.’ Said Rabbi Akiva, what do we find in the synagogue? The [law is the] same for many as for few; say "Bless God." Rabbi Yishmael says, "Bless God, the blessed."

Mishnah 4ד׳

שְׁלשָׁה שֶׁאָכְלוּ כְאֶחָד, אֵינָן רַשָּׁאִין לֵחָלֵק, וְכֵן אַרְבָּעָה, וְכֵן חֲמִשָּׁה. שִׁשָּׁה נֶחֱלָקִין, עַד עֲשָׂרָה. וַעֲשָׂרָה אֵינָן נֶחֱלָקִין, עַד שֶׁיִּהְיוּ עֶשְׂרִים:

Three that eat together are not allowed to separate, and so [if there are] four, and so [if there are] five. Six may be separated until ten, and ten may not be separated until [there are at least] twenty.

Mishnah 5ה׳

שְׁתֵּי חֲבוּרוֹת שֶׁהָיוּ אוֹכְלוֹת בְּבַיִת אֶחָד, בִּזְמַן שֶׁמִּקְצָתָן רוֹאִין אֵלּוּ אֶת אֵלּוּ, הֲרֵי אֵלּוּ מִצְטָרְפִים לְזִמּוּן. וְאִם לָאו, אֵלּוּ מְזַמְּנִין לְעַצְמָן, וְאֵלּוּ מְזַמְּנִין לְעַצְמָן. אֵין מְבָרְכִין עַל הַיַּיִן עַד שֶׁיִּתֵּן לְתוֹכוֹ מַיִם, דִּבְרֵי רַבִּי אֱלִיעֶזֶר. וַחֲכָמִים אוֹמְרִים, מְבָרְכִין:

When two groups eat together in one house, at a time when some of them see each other they may join to convene, and if not, these convene to themselves and those convene to themselves. The blessing over wine cannot be said until one adds water to it. These are the words of Rabbi Eliezer, and the Sages say they can bless.