31:42ל״א:מ״ב
1 א

ופחד יצחק. לֹא רָצָה לוֹמַר אֱלֹהֵי יִצְחָק, שֶׁאֵין הַקָּבָּ"ה מְיַחֵד שְׁמוֹ עַל הַצַּדִּיקִים בְּחַיֵּיהֶם, וְאַעַ"פִּ שֶׁאָמַר לוֹ בְּצֵאתוֹ מִבְּאֵר שֶׁבַע אֲנִי ה' אֱלֹהֵי אַבְרָהָם אָבִיךָ וֵאלֹהֵי יִצְחָק, בִּשְׁבִיל שֶׁכָּהוּ עֵינָיו, וַהֲרֵי הוּא כַּמֵּת; יַעֲקֹב נִתְיָרֵא לוֹמַר אֱלֹהֵי, וְאָמַר וּפַחַד:

ופחד יצחק AND THE DREAD OF ISAAC — He did not like to say “God of Isaac” because God does not associate His name with the righteous whilst they are alive. And although He (God) said, when he (Jacob) was departing from Beer-Sheba, (Genesis 28:13) “I am the Lord, the God of Abraham thy father and the God of Isaac”, this was because his (Isaac’s) eyes were dim and he might therefore be regarded as dead (Midrash Tanchuma, Toldot 7) — Jacob, however, feared to say “God of Isaac” and said “the Dread”.

2 ב

ויוכח. לְשׁוֹן תּוֹכָחָה הוּא וְלֹא לְשׁוֹן הוֹכָחָה:

ויוכח The word here has the meaning of reproof (“and he reproved thee”; cf. Genesis 5:24) and not of deciding (as in Genesis 5:37).