Daily Zohar 4179
Holy Zohar text. Daily Zohar -4179

Hebrew translation:

141. לְהִתְקַיֵּם רוּחַ עִם רוּחַ אִי אֶפְשָׁר, שֶׁהֲרֵי זֶה שֶׁעַכְשָׁו בָּא עָלֶיהָ, הִכְנִיס בָּהּ רוּחַ, וְכֵן אוֹתוֹ הָרִאשׁוֹן שֶׁהִסְתַּלֵּק הִכְנִיס בָּהּ רוּחַ. אוֹתוֹ רִאשׁוֹן שֶׁהִסְתַּלֵּק הָיוּ לוֹ בָּנִים, וְזֶה שֶׁל עַכְשָׁו אֵינוֹ גוֹאֵל רוּחַ שֶׁהִשְׁאִיר אוֹתוֹ רִאשׁוֹן בְּאוֹתוֹ כְּלִי, וּבָא הָאַחֵר הַזֶּה וְהִכְנִיס בָּהּ רוּחַ, וַדַּאי שֶׁלֹּא יוּכְלוּ שְׁנֵיהֶם לְהִתְקַיֵּם בְּאוֹתוֹ גוּף הָאִשָּׁה כְּאֶחָד. וְאִם נֹאמַר שֶׁנֶּאֱבַד – אִי אֶפְשָׁר. מַה נַּעֲשָׂה מִמֶּנּוּ?
142. אַף כָּךְ אִם הִיא לֹא נִשְׂאָה, אוֹתָהּ רוּחַ שֶׁהִשְׁאִיר בָּהּ בַּעְלָהּ מַה נַּעֲשֶׂה מִמֶּנָּה? אִם נֹאמַר שֶׁתֹּאבַד – לֹא כָּךְ. כָּל זֶה צָרִיךְ עַכְשָׁו לְגַלּוֹת. זָקֵן זָקֵן, רְאֵה מֶה עָשִׂיתָ וּבַמָּה הִכְנַסְתָּ אֶת עַצְמְךָ. קוּם זָקֵן הָרֵם דִּגְלְךָ! קוּם זָקֵן וְהַשְׁפֵּל עַצְמְךָ לִפְנֵי רִבּוֹנְךָ!


Zohar Mishpatim
Continued from previous DZ
It is not possible for two soul levels of Ruach to coexist in the same vessel. The late husband put his Ruach in her, and now the new husband put his Ruach in her.
That first husband who passed away had sons, and the one of this time is not a redeemer (גואל), and so the Ruach that the first one left in that vessel, and the one that came after this one and brought Ruach in it as well. Surely they cannot both exist together in that woman’s body. And if we say that one will perish, this is impossible because nothing is lost, as said above. Then what will be with the extra Ruach?

If the widow is not married again, what happens with the Ruach that her husband left in her? What would be done with it? We cannot say that it will perish. All this needs to be revealed now. The elder said to himself, old man, look what you’ve done and what you’ve gotten yourself into. Stand up, old man, raise your flag. Get up, and humble yourself before your Master.

The Zohar raises a question that is not related to Yibum. We learned that during the first penetration, the husband passes his soul level of Ruach into his wife’s vessel. It is made to sanctify the holy connection between them and to support future pregnancies. Since there could be no two Ruach in the same vessel, the elder (Saba D’Mishpatim) tries to answer the question.
According to Torah laws, a husband whose wife had intercourse with another man is forbidden to her husband because the holy connection broke.