12:3י״ב:ג׳
1 א

ונברכו בך. יֵשׁ אַגָּדוֹת רַבּוֹת, וְזֶהוּ פְשׁוּטוֹ, אָדָם אוֹמֵר לִבְנוֹ תְּהֵא כְּאַבְרָהָם, וְכֵן כָּל וְנִבְרְכוּ בְךָ שֶׁבַּמִּקְרָא, וְזֶה מוֹכִיחַ בְּךָ יְבָרֵךְ יִשְׂרָאֵל לֵאמֹר יְשִׂמְךָ אֱלֹהִים כְּאֶפְרַיִם וְכִמְנַשֶּׁה (בר' מ"ח):

ונברכו בך AND IN THEE SHALL BE BLESSED — There are many Agadoth concerning this but the plain sense of the text is as follows: A man says to his son, “Mayest thou become as Abraham”. This, too, is the meaning wherever the phrase ונברכו בך “And in thee shall be blessed” occurs in Scripture, and the following example proves this: (Genesis 48:20) בך יברך “By thee shall Israel bless their children saying, “May God make thee as Ephraim and Manasseh”.