Commento su Genesi 27:21

גשה נא ואמשך STEP NEAR, I PRAY THEE, THAT I MAY FEEL THEE — Isaac said to himself, “It is not Esau’s way to mention the name of God so readily, and this one says, “Because the Lord thy God caused it thus to happen to me! קול יעקב (Genesis Rabbah 65:19).

COME NEAR, I PRAY THEE, THAT I MAY FEEL THEE. Rashi comments: “Isaac said to himself, ‘It is not Esau’s way to have the Name of Heaven so readily in his mouth.’” This interpretation is found in Bereshith Rabbah.²⁰⁹Bereshith Rabbah 65:16. Due to the fact that the voices of the brothers were alike, it was necessary for the Sages to interpret the verse, The voice is the voice of Jacob, as referring to the kind of language Jacob used.
But I wonder about this for Esau was not wicked in his father’s eyes!²¹³This being so, how could the mention of G-d be a distinguishing mark for Jacob? Perhaps Isaac thought that since Esau is a man of the field and his heart is set on the hunt, he is not wont to mention the Name of Heaven for fear that he might mention it in some unclean place and without proper concentration. In the eyes of his father, this was considered a manifestation of his fear of Heaven. In line with the simple meaning of Scripture, this was because of vocal recognition.²¹⁴Since the voice instilled doubt as to his identity, Isaac desired to feel him.

ויאמר...ואמשך בני, the letter ש in the word ואמשך lacks the dagesh we would expect if it were in the transitive mode. It should have had this dagesh just as it is written with the dagesh in the word ימושני in verse 12 and in verse 22.

It is unusual for Eisov to readily mention God’s Name... You might ask: Did not Yitzchok consider Eisov completely righteous? The answer is: For the very reason that he was completely righteous, he would not mention Hashem’s Name needlessly! [You might object:] This surely should be true of Yaakov, and Yitzchok considered him more righteous than Eisov, as explained above. [The answer is:] Yitzchok reasoned that Eisov cannot avoid filthy places, thus he is more careful than Yaakov about mentioning Hashem’s Name. For Yaakov dwelled in tents [of Torah study] and did not enter filthy places.