Mishnayos Avos Perek 3 Mishnah 2

Rabbi Hanina, the vice-high priest said: pray for the welfare of the government, for were it not for the fear it inspires, every man would swallow his neighbor alive. R. Hananiah ben Teradion said: if two sit together and there are no words of Torah [spoken] between them, then this is a session of scorners, as it is said: “nor sat he in the seat of the scornful…[rather, the teaching of the Lord is his delight]” (Psalms 1:1); but if two sit together and there are words of Torah [spoken] between them, then the Shekhinah abides among them, as it is said: “then they that feared the Lord spoke one with another; and the Lord hearkened and heard, and a book of remembrance was written before Him, for them that feared the Lord and that thought upon His name” (Malachi 3:16). Now I have no [scriptural proof for the presence of the Shekhinah] except [among] two, how [do we know] that even one who sits and studies Torah the Holy One, blessed be He, fixes his reward? As it is said: “though he sit alone and [meditate] in stillness, yet he takes [a reward] unto himself” (Lamentations 3:28).

רַבִּי חֲנִינָא סְגַן הַכֹּהֲנִים אוֹמֵר, הֱוֵי מִתְפַּלֵּל בִּשְׁלוֹמָהּ שֶׁל מַלְכוּת, שֶׁאִלְמָלֵא מוֹרָאָהּ, אִישׁ אֶת רֵעֵהוּ חַיִּים בְּלָעוֹ. רַבִּי חֲנִינָא בֶן תְּרַדְיוֹן אוֹמֵר, שְׁנַיִם שֶׁיּוֹשְׁבִין וְאֵין בֵּינֵיהֶן דִּבְרֵי תוֹרָה, הֲרֵי זֶה מוֹשַׁב לֵצִים, שֶׁנֶּאֱמַר (תהלים א) וּבְמוֹשַׁב לֵצִים לֹא יָשָׁב. אֲבָל שְׁנַיִם שֶׁיּוֹשְׁבִין וְיֵשׁ בֵּינֵיהֶם דִּבְרֵי תוֹרָה, שְׁכִינָה שְׁרוּיָה בֵינֵיהֶם, שֶׁנֶּאֱמַר (מלאכי ג) אָז נִדְבְּרוּ יִרְאֵי יְיָ אִישׁ אֶל רֵעֵהוּ וַיַּקְשֵׁב יְיָ וַיִּשְׁמָע וַיִּכָּתֵב סֵפֶר זִכָּרוֹן לְפָנָיו לְיִרְאֵי יְיָ וּלְחֹשְׁבֵי שְׁמוֹ. אֵין לִי אֶלָּא שְׁנַיִם, מִנַּיִן שֶׁאֲפִלּוּ אֶחָד שֶׁיּוֹשֵׁב וְעוֹסֵק בַּתּוֹרָה, שֶׁהַקָּדוֹשׁ בָּרוּךְ הוּא קוֹבֵעַ לוֹ שָׂכָר, שֶׁנֶּאֱמַר (איכה ג) יֵשֵׁב בָּדָד וְיִדֹּם כִּי נָטַל עָלָיו: