110. וַיֹּאמֶר אֶל שָׂרַי אִשְׁתּוֹ הִנֵּה נָא יָדַעְתִּי כִּי אִשָּׁה יְפַת מַרְאֶה אָתְּ. וְכִי עַד הַשָּׁעָה הַהִיא לֹא הָיָה יוֹדֵעַ אַבְרָהָם שֶׁהָיְתָה אִשָּׁה יְפַת מַרְאֶה? אֶלָּא זֶה פֵּרְשׁוּהָ, שֶׁעַד הַשָּׁעָה הַהִיא לֹא הִסְתַּכֵּל בִּדְמוּת שָׂרָה מֵרֹב הַצְּנִיעוּת שֶׁהָיְתָה בֵינֵיהֶם. וּכְשֶׁקָּרַב לְמִצְרַיִם, הִיא הִתְגַּלְּתָה וְרָאָה אוֹתָהּ.
111. דָּבָר אַחֵר, בַּמֶּה יָדַע? אֶלָּא עַל יְדֵי טֹרַח הַדֶּרֶךְ אָדָם מִתְבַּזֶּה, וְהִיא עָמְדָה בְּיָפְיָהּ וְלֹא הִשְׁתַּנְּתָה. דָּבָר אַחֵר הִנֵּה נָא יָדַעְתִּי, שֶׁרָאָה עִמָּהּ אֶת הַשְּׁכִינָה, וּמִשּׁוּם כָּךְ בָּטַח אַבְרָהָם וְאָמַר אֲחֹתִי אָתְּ.
Zohar Lech Lecha
Abraham went down to Egypt before he was commanded by God to do so. Because of that, his children were enslaved for four hundred years.
And Abraham said unto Sarai, his wife “Indeed I know that you are a woman of beautiful appearance.” (Genesis 12:11)
The Zohar asks “Didn’t Abraham know that she was a beautiful woman before they came to Egypt? “ and explains that he didn’t look at his wife because of the modesty that was between them. And when he came near to Egypt she was revealed, and he saw her.
Rabbi Ashlag explains that when Abraham came close to Egypt, he got connected to the Light of Chokmah that continued to his wife. The eyesight has the aspect of Chokmah and because of that Abraham could see the beauty that was revealed from the illumination of Chokmah over the Chassadim of Sarah.
Another explanation is that Sarah was always beautiful, and when Abraham elevated with the light of Chokmah, he could see the Shechina with Sarah, and because of that he said;
“אִמְרִי נָא אֲחֹתִי אָתְּ לְמַעַן יִיטַב לִי בַעֲבוּרֵךְ וְחָיְתָה נַפְשִׁי בִּגְלָלֵךְ.”
“Please say you are my sister, that it may be well with me for your sake, and that I may live because of you.”