Daily Zohar 3741
Holy Zohar text. Daily Zohar -3741

Hebrew translation:

58. וּלְעוֹלָם הַבְדָּלָה הִיא בַּשֵּׁנִי, שֶׁהוּא שְׂמֹאל בְּרֵאשִׁית וְרֹגֶז שֶׁמְּעוֹרֵר הַשְּׂמֹאל בַּמַּחֲלֹקֶת, עֲדַיִן שֶׁלֹּא שׁוֹכֵךְ בִּמְנוּחָה, וְנִבְרָא בּוֹ גֵּיהִנֹּם. אָז נִבְרְאוּ כָּל אוֹתָם מַלְאָכִים שֶׁמְּקַטְרְגִים לְרִבּוֹנָם לְמַעְלָה, וְאָכְלָה אוֹתָם הָאֵשׁ וְנִשְׂרְפוּ, וְכֵן כָּל שְׁאָר אֵלֶּה שֶׁמִּתְבַּטְּלִים, וְאֵין לָהֶם קִיּוּם וְנֶאֶכְלוּ בָּאֵשׁ. כְּמוֹ זֶה קֹרַח לְמַטָּה, וְהַכֹּל כְּמוֹ זֶה.
59. יְהִי רָקִיעַ – הִתְפַּשְּׁטָה הִתְפָּרְדוּת זוֹ מִזּוֹ. א”ל – כָּתֵף שֶׁל יָמִין אֵ”ל גָּדוֹל הִתְפַּשֵּׁט הִתְפָּרְדוּת מִתּוֹךְ הַמַּיִם לְהִשְׁתַּלֵּם הַשֵּׁם הַזֶּה אֵ”ל וּלְהִתְכַּלֵּל בְּאוֹתָהּ הִתְפָּרְדוּת זֶה בָּזֶה, וְהִתְפָּרֵד מֵאֵל אֱלֹהִים הי”ם. אֵלֶּה הִתְפָּרְדוּ וְהִתְהַפְּכוּ לִהְיוֹת מַיִם תַּחְתּוֹנִים ימ”ה, אוֹתָהּ הִתְפָּרְדוּת שֶׁהִתְפַּשֵּׁט בַּשֵּׁנִי. מַיִם עֶלְיוֹנִים הי”ם, זֶה הַיָּ”ם גָּדוֹל. הי”ם מַיִם עֶלְיוֹנִים. הַהֵפֶךְ שֶׁל הָאוֹתִיּוֹת הָאֵלֶּה ימ”ה, מַיִם תַּחְתּוֹנִים. כֵּיוָן שֶׁהִתְתַּקְּנוּ, נַעֲשׂוּ הַכֹּל כְּלָל אֶחָד וְהִתְפָּרֵד שֵׁם זֶה בְּכַמָּה מְקוֹמוֹת.


Zohar Beresheet
The separation from the other side is always done on the second, which is the Left line. The Havdalah after Shabbat is to separate the Sitra Achra that comes from the Left line.
Gevurah and anger awakened on the Left at the beginning of the division, and peace had not yet been restored. At that time, Gehennam was created. Then came the creation of all the angels on the Left that go against the decisions and control of their master, the Holy One Blessed be He that is the middle line. Since they come from the Left, fire can burn them.
Similarly, Korach that came from the left fell and burnt in Gehennam like the angels that get burnt in the fire of the Dinur river.

Genesis 1:6
“וַיֹּאמֶר אֱלֹהִים יְהִי רָקִיעַ בְּתוֹךְ הַמָּיִם וִיהִי מַבְדִּיל בֵּין מַיִם לָמָיִם.”
“Then God said, “Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.”
This command caused the lower and upper water to separate. The lower firmament expanded and separated from the upper water. The upper water expanded and separated from the lower water by the firmament.
Binah is called water the sefirot of Keter, Chokmah, Binah, Tiferet (Z”A), and Malchut are the five letters of the name אלהים (ELHYM). God’s saying, “Let there be a firmament,” means that the firmament comes between the water, which is the middle letter ה H of the name that comes under the letters אל EL. These two letters represent Keter and Chokmah that expand from the firmament and above it in the secret of upper water and Chassadim. The three letters הי”ם (HYM) are for Binah, Tiferet (Z”A), and Malchut. They expand downward the firmament in the secret of the lower water. The letters אל EL of אלהים ELHYM that from the firmament and above are on the Right side that represents Chessed.
Because of the firmament, the name אל EL expanded and separated from the water of Binah to become אל גדול ‘great EL’. אל EL is the name that represents Chessed. The three letters הי”ם HYM that are from the firmament and down return to complete the letters אל EL and become אלהים (ELHYM).
Because the waters come from Binah that is the aspect of the upper three sefirot, the two parts are called גדול ‘great’. אל גדול ‘Great El ’, and הים הגדול ‘the great sea’.

The Zohar reveals the creation process during the saying/command, “Let there be…”.
The name of the Sefira of Chessed used to be ‘גדולה’ ‘greatness,’ pronounced “Gedulah.” It appears in old drawings of the ten sefirot.
From this study, we understand why it was called so.

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