Shnayim Sheyoshvin - In The Seforim Age (Avos 3:3)
Avot3: 3
רַבִּי שִׁמְעוֹן אוֹמֵר: שְׁלשָׁה שֶׁאָכְלוּ עַל שֻׁלְחָן אֶחָד, וְלֹא אָמְרוּ עָלָיו דִּבְרֵי תוֹרָה — כְּאִלּוּ אָכְלוּ מִזִּבְחֵי מֵתִים, שֶׁנֶּאֱמַר: ”כִּי כָּל־שֻׁלְחָנוֹת מָלְאוּ קִיא צֹאָה בְּלִי מָקוֹם”. אֲבָל שְׁלשָׁה שֶׁאָכְלוּ עַל שֻׁלְחָן אֶחָד, וְאָמְרוּ עָלָיו דִּבְרֵי תוֹרָה — כְּאִלּוּ אָכְלוּ מִשֻּׁלְחָנוֹ שֶׁל מָקוֹם בָּרוּךְ הוּא, שֶׁנֶּאֱמַר: ”וַיְדַבֵּר אֵלַי, זֶה הַשֻּׁלְחָן אֲשֶׁר לִפְנֵי ה' ”.
Rabbi Shimon says: [If] three people ate at the same table and did not speak words of Torah upon it, it is as if they ate from offerings of the dead, as it is stated: For all tables are full of vomit [and] filth, without the Omnipresent. But three who ate at the same table and spoke words of Torah upon it, it is as if they ate from the table of the Omnipresent, Blessed is He, as it is stated: And [the angel] said to me, “This is the table that is before Hashem.”