זוהר, וישב י״חZohar, Vayeshev 18

Segment 1א׳

וַתָּסַר בִּגְדֵי אַלְמְנוּתָהּ מֵעָלֶיהָ וְגו', תָּא חֲזֵי, תָּמָר בַּת כֹּהֵן הֲוַת, וְכִי סַלְקָא דַעְתָּךְ דְּאִיהִי אָזְלָא בְּגִין לְאַזְנָאָה עִם חָמוּהָ, דְּהָא אִיהִי צְנִיעוּתָא אִשְׁתַּכְּחַת בָּהּ תָּדִיר. אֶלָּא אִיהִי צַדֶּקֶת הֲוַת וּבְחָכְמָה עָבְדַת הַאי, דְּהָא אִיהִי לָא אַפְקָרַת גַּרְמָהּ לְגַבֵּיהּ, אֶלָּא בְּגִין דִּידִיעָה יָדְעַת וְחָכְמְתָא אִסְתַּכָּלַת. וְעַל דָּא אִיהִי אָתַת לְגַבֵּיהּ לְמֶעְבַּד (עמיה) טִיבוּ וּקְשׁוֹט, וְעַל דָּא אָתַת (להדיה) וְאִשְׁתַּדְּלַת בְּעִסְקָא דָא.

AND SHE PUT OFF FROM HER THE GARMENTS OF HER WIDOWHOOD. Tamar was the daughter of a priest, and it can hardly be imagined that she set out with the intention of committing incest with her father-in-law, since she was by nature chaste and modest. She was indeed virtuous and did not prostitute herself, and it was out of her deeper knowledge and wisdom that she approached Judah, and a desire to act kindly and faithfully (towards the dead).

Segment 2ב׳

תָּא חֲזֵי, בְּגִין דְּאִיהִי יָדְעַת יְדִיעָה וְאִשְׁתַּדְּלַת בְּעִסְקָא דָא. קוּדְשָׁא בְּרִיךְ הוּא עֲבַד סִיּוּעָא תַּמָּן בְּהַהוּא עוֹבָדָא וְאִתְעֲבְּרַת מִיָּד. וְכֹלָּא הֲוָה מִנֵּיהּ. וְאִי תֵימָא אַמַּאי לָא אַיְיתֵי קוּדְשָׁא בְּרִיךְ הוּא אִינוּן בְּנִין מֵאִתְּתָא אוֹחֲרָא, אַמַּאי מִן דָּא. אֶלָּא וַדַּאי אִיהִי אִצְטְרִיכָא לְעוֹבָדָא דָא וְלָא אִתְּתָא אָחֳרָא.

And it was because her act was based on a deeper knowledge that God aided her and she straightway conceived. So that it was all ordained from on high. If it is asked, why did not God cause those sons to be born from some other woman, the answer is that Tamar was necessary for this purpose, and not any other woman.

Segment 3ג׳

תְּרֵין נְשִׁין הֲווּ דְּמִנַּיְיהוּ אִתְבְּנֵי זַרְעָא דִיהוּדָה, וְאֲתוּ מִנַּיְיהוּ דָּוִד מַלְכָּא וּשְׁלֹמֹה מַלְכָּא וּמַלְכָּא מְשִׁיחָא. וְאִלֵּין תְּרֵין נְשִׁין דָּא כְּגַוְונָא דְּדָא, תָּמָר וְרוּת דְּמִיתוּ בַּעֲלַיְיהוּ בְּקַדְמִיתָא, וְאִינוּן אִשְׁתַּדְּלוּ לְעוֹבָדָא דָא.

There were two women from whom the seed of Judah was to be built up, from whom were to descend King David, King Solomon, and the Messiah, viz. Tamar and Ruth. These two women had much in common. Both lost their first husbands, and both took similar steps to replace them.