and only after this happened, then it became possible for a Unification Above in Atzilus to be dependent on the mitzvah actions of the people living in the lowest world. י ולָ ת ןֹויְלֶע ד וחִּי תֹויְהִּל ךָ שְמִּנ יַזֲאַו ב ְמַעֲש ֵה הַת ַחְ ת וֹנִּים .
Now, the main revelation of this Unification is through the Torah. יֵדְי לַע א וה ד וחִּ יַה י ו ליִּ ג רַ קיִּעְו הַת וֹרָה ;
However, the Forefathers (Avraham, Yitzchok, and Yaakov) prepared the world for the Torah, תַניִּחְבִּל הָנָכֲה ו שָע תֹובָאָה ךַא הַת וֹרָה ,
as is written, “And the Torah was placed in Yisrael,” meaning, that “By way of Yisrael” the Torah was given. For Avraham drew down the right line, Chesed – Kindness, Yitzchok drew dawn the left line line, Gevurah-Severity, and Yisroel (Yaakov) drew down Tiferes-Mercy/Beauty. כ ְמוֹ ש ֶכ ָתו ב (ת ְ הִּל ִּים עח, ה) : "וְתוֹרָה ש ָם ב ְיִּש ְ רָ אֵל" – עַל יְדֵי וַק ךָ שְמִּנ םָהָרְבַא יֵדְי לַע יִּ כ .לֵאָרְ שִּי יָמִּ ין – חֶסֶד כוּ' .
The Torah is mainly focused on revealing Hashem in these three channels of Chesed-Kindness, Gevura-Severity, and Tiferes-Beauty, corresponding to Torah-Yaakov, Prayer-Yitzchok, and Kindness-Avraham. Therefore, through the service of Hashem of the Forefathers, they prepared the world for the complete revelation of Hashem through the Torah and Mitzvos that are fulfilled after the Giving of the Torah.
This is the idea of the Book of Bereishis, which does not teach וְזֶהו עִּנְיַן סֵפֶר ב ְרֵ אש ִּ ית , ש ֶאֵין ב וֹ
In particular, Yaakov, who is also called Yisroel, affected a greater preparation for the Giving of the Torah, since he included in himself both aspects of his father and grandfather, of Kindness and Severity, and how both merges together. Since the Torah is about merging physicality with Divinity, the aspect of Yisroel is a greater preparation. This is why the verse focuses on “Yisroel,” that “the Torah was placed in/through Yisroel,” even though Avraham and Yitzchoks’ service of Hashem were also necessary preparations.