Blessed is He and blessed is His Name
Blessed is the Lord, and blessed be His Name.
(Since Israel is destined to unify with the Creator of the world in one language, as it is said, 'Hear, O Israel: the Lord our God, the Lord is one' (Deuteronomy 6:4), the day is called one, for all who unify His Name acknowledge that He created His world, 'Blessed is He and blessed is His Name' - Pesiqta Zutarta (Lekah Tov), Genesis chapter 1. Likewise: When the cantor says, 'Blessed are You, Lord our God and God of our fathers,' and begins the prayer, the congregation responds, 'Blessed is He and blessed is His Name.' Some say, 'Blessed be the Name of His glorious kingdom forever and ever,' and some say, 'May the Name of the Lord be blessed from now and forever.' Therefore, the one who reads the Name should mention it with reverence, for it is fitting - Commentary on the Prayer Siddur by Rokach (Tzad) Ratzah b'Menuchateinu, 183, and also: I said to her, 'Since you ask about the peace of every person, I will ask for your peace.' She answered me, 'Blessed is He and blessed is His Name' - Agnon, Ad Hena, Tehillah, 142.)
Translation
Expression (Hebrew)
בָּרוּךְ הוּא וּבָרוּךְ שְׁמוֹ
Definition (Hebrew)
מְבֹרָךְ הוּא ה' וּמְבֹרָךְ יְהֵא שְׁמוֹ.
("לְפִי שֶׁעֲתִידִין יִשְׂרָאֵל לְיַחֵד לְבוֹרֵא הָעוֹלָם בִּלְשׁוֹן אֶחָד, שֶׁנֶּאֱמַר שְׁמַע יִשְׂרָאֵל ה' אֱלֹהֵינוּ ה' אֶחָד (דְּבָרִים ו ד), נִקְרָא יוֹם אֶחָד, שֶׁכָּל הַמְּיַחֵד שְׁמוֹ מוֹדֶה שֶׁהוּא בָּרָא עוֹלָמוֹ, בָּרוּךְ הוּא וּבָרוּךְ שְׁמוֹ"-פְּסִיקְתָּא זוֹטְרָתָא (לֶקַח טוֹב) בְּרֵאשִׁית פֶּרֶק א,וְכֵן:"כְּשֶׁהַחַזָּן אוֹמֵר בָּרוּךְ אַתָּה ה' אֱלֹהֵינוּ וֵאלֹהֵי אֲבוֹתֵינוּ וּמַתְחִיל הַתְּפִלָּה, הַקָּהָל עוֹנִים בָּרוּךְ הוּא וּבָרוּךְ שְׁמוֹ, וְיֵשׁ אוֹמְרִים בָּרוּךְ שֵׁם כְּבוֹד מַלְכוּתוֹ לְעוֹלָם וָעֶד, וְיֵשׁ אוֹמְרִים יְהִי שֵׁם ה' מְבֹרָךְ מֵעַתָּה וְעַד עוֹלָם. עַל כֵּן יִזְהָר הַקּוֹרֵא אֶת הַשֵּׁם שֶׁיַּזְכִּירוּ בְּיִרְאָה כִּי כֵן נָאֶה לוֹ"- פֵּרוּשֵׁי סִדּוּר הַתְּפִלָּה לָרוֹקֵחַ (צַד) רָצָה בִּמְנוּחָתֵנוּ, תקלג, וְכֵן:"אָמַרְתִּי לָהּ, מֵאַחַר שֶׁאַתְּ שׁוֹאֶלֶת בִּשְׁלוֹם כָּל אָדָם אֶשְׁאַל אֲנִי לִשְׁלוֹמֵךְ. עָנְתָה וְאָמְרָה לִי,בָּרוּךְ הוּא וּבָרוּךְ שְׁמוֹ"- עַגְנוֹן, עַד הֵנָּה, תְּהִלָּה, 142)