אָמַר רַבִּי אָבִין בַּר רַב אַדָּא, אָמַר רַבִּי יִצְחָק: מִנַּיִן שֶׁהַקָּדוֹשׁ בָּרוּךְ הוּא מַנִּיחַ תְּפִילִּין שֶׁנֶּאֱמַר: ״נִשְׁבַּע ה׳ בִּימִינוֹ וּבִזְרוֹעַ עֻזּוֹ״. ״בִּימִינוֹ״ — זוֹ תּוֹרָה, שֶׁנֶּאֱמַר: ״מִימִינוֹ אֵשׁ דָּת לָמוֹ״, ״וּבִזְרוֹעַ עֻזּוֹ״ — אֵלּוּ תְּפִילִּין, שֶׁנֶּאֱמַר: ״ה׳ עֹז לְעַמּוֹ יִתֵּן״. וּמִנַּיִן שֶׁהַתְּפִילִּין עוֹז הֵם לְיִשְׂרָאֵל — דִּכְתִיב: ״וְרָאוּ כׇּל עַמֵּי הָאָרֶץ כִּי שֵׁם ה׳ נִקְרָא עָלֶיךָ וְיָרְאוּ מִמֶּךָּ״. וְתַנְיָא, רַבִּי אֱלִיעֶזֶר הַגָּדוֹל אוֹמֵר: אֵלּוּ תְּפִילִּין שֶׁבָּרֹאשׁ. אֲמַר לֵיהּ רַב נַחְמָן בַּר יִצְחָק לְרַב חִיָּיא בַּר אָבִין: הָנֵי תְּפִילִּין דְּמָרֵי עָלְמָא מָה כְּתִיב בְּהוּ? אֲמַר לֵיהּ ״וּמִי כְּעַמְּךָ יִשְׂרָאֵל גּוֹי אֶחָד בָּאָרֶץ״. וּמִי מִשְׁתַּבַּח קוּדְשָׁא בְּרִיךְ הוּא בְּשִׁבְחַיְיהוּ דְּיִשְׂרָאֵל? אִין, דִּכְתִיב: ״אֶת ה׳ הֶאֱמַרְתָּ הַיּוֹם״. וּכְתִיב: ״וַה׳ הֶאֱמִירְךָ הַיּוֹם״, אָמַר לָהֶם הַקָּדוֹשׁ בָּרוּךְ הוּא לְיִשְׂרָאֵל: אַתֶּם עֲשִׂיתוּנִי חֲטִיבָה אַחַת בָּעוֹלָם, וַאֲנִי אֶעֱשֶׂה אֶתְכֶם חֲטִיבָה אַחַת בָּעוֹלָם. אַתֶּם עֲשִׂיתוּנִי חֲטִיבָה אַחַת בָּעוֹלָם, שֶׁנֶּאֱמַר: ״שְׁמַע יִשְׂרָאֵל ה׳ אֱלֹהֵינוּ ה׳ אֶחָד״, וַאֲנִי אֶעֱשֶׂה אֶתְכֶם חֲטִיבָה אַחַת בָּעוֹלָם״, שֶׁנֶּאֱמַר ״וּמִי כְּעַמְּךָ יִשְׂרָאֵל גּוֹי אֶחָד בָּאָרֶץ״. אֲמַר לֵיהּ רַב אַחָא בְּרֵיהּ דְּרָבָא לְרַב אָשֵׁי: תִּינַח בְּחַד בֵּיתָא, בִּשְׁאָר בָּתֵּי מַאי? אָמַר לֵיהּ: ״כִּי מִי גוֹי גָּדוֹל״, ״וּמִי גּוֹי גָּדוֹל״, ״אַשְׁרֶיךָ יִשְׂרָאֵל״, ״אוֹ הֲנִסָּה אֱלֹהִים״, ״וּלְתִתְּךָ עֶלְיוֹן״. אִי הָכִי, נְפִישִׁי לְהוּ טוּבֵי בָּתֵּי? אֶלָּא: ״כִּי מִי גוֹי גָּדוֹל״ ״וּמִי גּוֹי גָּדוֹל״ דְּדׇמְיָין לַהֲדָדֵי — בְּחַד בֵּיתָא, ״אַשְׁרֶיךָ יִשְׂרָאֵל״ ״וּמִי כְּעַמְּךָ יִשְׂרָאֵל״ — בְּחַד בֵּיתָא, ״אוֹ הֲנִסָּה אֱלֹהִים״ — בְּחַד בֵּיתָא, ״וּלְתִתְּךָ עֶלְיוֹן״ — בְּחַד בֵּיתָא. וְכוּלְּהוּ כְּתִיבִי בְּאֶדְרָעֵיהּ.
The Gemara cites another aggadic statement: Rabbi Avin bar Rav Adda said that Rabbi Yitzḥak said: From where is it derived that the Holy One, Blessed be He, wears phylacteries? As it is stated: “The Lord has sworn by His right hand, and by the arm of His strength” (Isaiah 62:8). Since it is customary to swear upon holy objects, it is understood that His right hand and the arm of His strength are the holy objects upon which God swore. Specifically, “His right hand” refers to the Torah, as it is stated in describing the giving of the Torah: “From His right hand, a fiery law for His people” (Deuteronomy 33:2). “The arm of His strength,” His left hand, refers to phylacteries, as it is stated: “The Lord gave strength to His nation” (Psalms 29:11), in the form of the mitzva of phylacteries. The Gemara asks: And from where is it derived that phylacteries provide strength for Israel? As it is written: “And all the nations of the land shall see that the name of the Lord is called upon you, and they will fear you” (Deuteronomy 28:10). It was taught in a baraita that Rabbi Eliezer the Great says: This is a reference to the phylacteries of the head, upon which the name of God is written in fulfillment of the verse: “That the name of the Lord is called upon you.” Rav Naḥman bar Yitzḥak said to Rav Ḥiyya bar Avin: What is written in the phylacteries of the Master of the world? Rav Ḥiyya bar Avin replied: It is written: “Who is like Your people, Israel, one nation in the land?” (I Chronicles 17:21). God’s phylacteries serve to connect Him, in a sense, to the world, the essence of which is Israel. Rav Naḥman bar Yitzḥak continues: Is the Holy One, Blessed be He, glorified through the glory of Israel? Rav Ḥiyya bar Avin answered: Yes, as indicated by the juxtaposition of two verses; as it is stated: “You have affirmed, this day, that the Lord is your God, and that you will walk in His ways and keep His laws and commandments, and listen to His voice.” And the subsequent verse states: “And the Lord has affirmed, this day, that you are His treasure, as He spoke to you, to keep His commandments” (Deuteronomy 26:17–18). From these two verses it is derived that the Holy One, Blessed be He, said to Israel: You have made Me a single entity [ḥativa] in the world, as you singled Me out as separate and unique. And because of this, I will make you a single entity in the world, and you will be a treasured nation, chosen by God. You have made Me a single entity in the world, as it is stated that Israel declares God’s oneness by saying: “Hear, Israel, the Lord is our God, the Lord is One” (Deuteronomy 6:4). And because of this, I will make you a single entity in the world, unique and elevated with the utterance: “Who is like Your people, Israel, one nation in the land?” Consequently, the Holy One, Blessed be He, is glorified through the glory of Israel whose praises are written in God’s phylacteries. Rav Aḥa, son of Rava said to Rav Ashi: It works out well with regard to the contents of one of the four compartments of God’s phylacteries of the head. However, all four compartments of Israel’s phylacteries of the head contain portions of the Torah that praise God. What portions in praise of Israel are written in the rest of the compartments of God’s phylacteries of the head? Rav Ashi said to him: In those three compartments it is written: “For who is a great nation, to whom God is close, like the Lord our God whenever we call upon Him?” (Deuteronomy 4:7); “And who is a great nation, who has righteous statutes and laws, like this entire Torah which I set before you today?” (Deuteronomy 4:8); “Happy are you, Israel, who is like you? A people saved by the Lord, the shield of your help, and that is the sword of your excellence. And your enemies shall dwindle away before you, and you shall tread upon their high places” (Deuteronomy 33:29); “Or has God attempted to go and take for Himself a nation from the midst of another nation, by trials, by signs and by wonders” (Deuteronomy 4:34); “And to elevate you above all nations that He has made, in praise, in name and in glory; that you may be a holy people to the Lord, your God, as He has spoken” (Deuteronomy 26:19). Rav Aḥa, son of Rava, raises an objection: If all of these verses are included in God’s phylacteries of the head, there are too many compartments as more than four verses of praise were listed. Rather, the portions in God’s phylacteries must be arranged as follows: The verses “For who is a great nation” and “And who is a great nation” are included in one compartment, as they are similar. “Happy are you, Israel” and "Who is like your people, Israel" are in one compartment. “Or has God attempted” is in one compartment and “And to elevate you” is in one compartment in the phylacteries of the head, where there are four separate compartments. And all of the verses are written together on one parchment in the phylacteries of the arm, which has only one compartment.