הנה נא ידעתי. מִדְרַש אַגָּדָה עַד עַכְשָׁו לֹא הִכִּיר בָּהּ מִתּוֹךְ צְנִיעוּת שֶׁבִּשְׁנֵיהֶם, וְעַכְשָׁו הִכִּיר בָּה עַל יְדֵי מַעֲשֶׂה. דָּבָר אַחֵר, מִנְהַג הָעוֹלָם שֶׁעַל יְדֵי טֹרַח הַדֶּרֶךְ אָדָם מִתְבַּזֶּה, וְזֹאת עָמְדָה בְּיָפְיָהּ. וּפְשׁוּטוֹ שֶׁל מִקְרָא הִנֵּה נָא הִגִּיעַ הַשָּׁעָה שֶׁיֵּשׁ לִדְאֹג עַל יָפְיֵךְ, יָדַעְתִּי זֶה יָמִים רַבִּים כִּי יְפַת מַרְאֶה אַתְּ, וְעַכְשָׁו אָנוּ בָאִים בֵּין אֲנָשִׁים שְׁחֹרִים וּמְכֹעָרִים, אֲחֵיהֶם שֶׁל כּוּשִׁים, וְלֹא הֻרְגְּלוּ בְאִשָּׁה יָפָה; וְדוֹמֶה לוֹ הִנֶּה נָּא אֲדֹנַי סוּרוּ נָא (בר' י"ט): הנה נא ידעתי BEHOLD NOW I KNOW — The Midrashic explanation is: Until now he had not perceived her beauty owing to the extreme modesty of both of them; now, however, through this event, he became cognisant of it (Midrash Tanchuma, Lech Lecha 5). Another explanation: Usually, because of the exertion of travelling a person becomes uncomely, but she had retained her beauty (Genesis Rabbah 40:4). Still, the real sense of the text is this: Behold, now the time has come when I am anxious because of thy beauty. I have long known that thou art fair of appearance: but now we are travelling among black and repulsive people, brethren of the Ethiopians (Kushim), who have never been accustomed to see a beautiful woman. A similar example is, (Genesis 19:2) “Behold, now, my lords, turn aside I pray you.”).
