זוהר, תוספות כרך א נ״אZohar, Addenda, Volume I 51

Segment 1א׳

וַיִּזְכּוֹר אֱלהִים אֶת רָחֵל, בְּשָׂרָה כְּתִיב פְּקִידָה, וּבְּרָחֵל כְּתִיב זְכִירָה. אַמָּאי, בְּגִין דְּזָכוֹר אִתְרְשִׁים בְּיַעֲקֹב דְּאִיהוּ בְּרִית שָׁלוֹם כָּד אִתְעֲבִיד יוֹסֵף, וּבְמָה כַּד נָטַל שׁוֹר בַּהֲדֵיהּ דְלָא יַתְקִיף לְסִטְרָא אַחֲרָא. וּבְגִין כָּךְ אִתְקְרֵי יוֹסֵף בְּכוֹר, דְּהַהוּא שׁוֹר דְנָטַל, בְּכוֹר שׁוֹרוֹ וַדָּאי, וְהַהוּא שׁוֹר, שׁוֹר תַּם וְיַעֲקֹב אִישׁ תַּם. רִבּוֹן וְשָׁלִיט מָארִיהּ דְּבֵיתָא, דְּהַהוּא שׁוֹר תַּם שָׁארֵי בְּגַוִּיהּ:

“And God remembered Rachel.” Of Sarah, visiting is written; and of Rachel, remembering is written. Why? Because “remember” is imprinted in Jacob, who is the covenant of peace, when Joseph was made. And by what? When he took the ox with him, so that it should not strengthen the other side. And therefore Joseph is called firstborn, for that ox which he took is assuredly “the firstling of his ox”; and that ox is shor tam (a harmless ox), and Jacob is ish tam (a whole-hearted man) — a lord and a ruler, the master of the house, in whom that harmless ox dwells.