Rav Avrohom Baruch Zachariash resumes his wildly popular Pirkei Avos shiur, this time on Thursday night via ZOOM.

Chapter 3:6

רַבִּי חֲלַפְתָּא בֶן דּוֹסָא אִישׁ כְּפַר חֲנַנְיָה אוֹמֵר, עֲשָׂרָה שֶׁיּוֹשְׁבִין וְעוֹסְקִין בַּתּוֹרָה, שְׁכִינָה שְׁרוּיָה בֵינֵיהֶם, שֶׁנֶּאֱמַר (תהלים פב) אֱלֹהִים נִצָּב בַּעֲדַת אֵל. וּמִנַּיִן אֲפִלּוּ חֲמִשָּׁה, שֶׁנֶּאֱמַר (עמוס ט) וַאֲגֻדָּתוֹ עַל אֶרֶץ יְסָדָהּ. וּמִנַּיִן אֲפִלּוּ שְׁלשָׁה, שֶׁנֶּאֱמַר (תהלים פב) בְּקֶרֶב אֱלֹהִים יִשְׁפֹּט. וּמִנַּיִן אֲפִלּוּ שְׁנַיִם, שֶׁנֶּאֱמַר (מלאכי ג) אָז נִדְבְּרוּ יִרְאֵי ה’ אִישׁ אֶל רֵעֵהוּ וַיַּקְשֵׁב ה’ וַיִּשְׁמָע וְגוֹ’. וּמִנַּיִן אֲפִלּוּ אֶחָד, שֶׁנֶּאֱמַר (שמות כ) בְּכָל הַמָּקוֹם אֲשֶׁר אַזְכִּיר אֶת שְׁמִי אָבֹא אֵלֶיךָ וּבֵרַכְתִּיךָ:

Rabbi Halafta of Kefar Hanania said: when ten sit together and occupy themselves with Torah, the Shechinah abides among them, as it is said: “God stands in the congregation of God” (Psalm 82:1). How do we know that the same is true even of five? As it is said: “This band of His He has established on earth” (Amos 9:6). How do we know that the same is true even of three? As it is said: “In the midst of the judges He judges” (Psalm 82:1) How do we know that the same is true even of two? As it is said: “Then they that fear the Lord spoke one with another, and the Lord hearkened, and heard” (Malachi 3:16). How do we know that the same is true even of one? As it is said: “In every place where I cause my name to be mentioned I will come unto you and bless you” (Exodus 20:21).