אבן העזר קע״גEven HaEzer 173

Se’if 1א׳

הַיְבָמָה שֶׁהִיא עֶרְוָה לַיָּבָם בְּאִסוּר כָּרֵת, חוּץ מִן הַנִּדָּה, אֵינָהּ זְקוּקָה לַיָּבָם, וּמֻתֶּרֶת לְזָר בְּלֹא חֲלִיצָה, וְכֵן צָרוֹתֶיהָ פְּטוּרוֹת מִן הַחֲלִיצָה וּמֵהַיִּבּוּם. וְאִם הָיָה לוֹ אָח אַחֵר, וְאַחַת מִצָּרוֹתֶיהָ נִתְיַבְּמָה לְאוֹתוֹ אָח, וְלוֹ נָשִׁים אֲחֵרוֹת, וּמֵת, כֻּלָּן פְּטוּרוֹת מֵחֲלִיצָה וּמִן הַיִּבּוּם. וְאִם הָיָה לוֹ עוֹד אָח אַחֵר, וְאַחַת מֵהַנָּשִׁים אֵלּוּ נִתְיַבְּמָה לוֹ, וְלוֹ נָשִׁים אֲחֵרוֹת, וּמֵת, כֻּלָּן פְּטוּרוֹת מֵהַחֲלִיצָה וּמֵהַיִבּוּם. וְכֵן עַד עוֹלָם:

A female obligated in Yibum (Levirate marriage) who is a forbidden sexual partner (lit. nakedness) to a male obligated in Yibum with a prohibition of excommunication, except for a menstruating woman who has not ritually purified herself, are not in need of performing Yibum, and are permitted to someone else (lit. stranger) without Chalitza (ceremony releasing woman from obligation to marry brother-in-law), and other wives in her widow's marriage are exempt from Yibum and Chalitza. And if he had another brother, and one of his other wives performed Yibum to the same brother, and this brother has other wives, and dies, all of them are exempt from Chalitza and Yibum. And if he had yet another brother, and one of these wives had performed Yibum to him, and this brother has other wives, and dies, they are all exempt from Chalitza and from Yibum. And so unto forever.

Se’if 2ב׳

אֲבָל אִם אַחַת מִכָּל הָעֲרָיוֹת נְשׂוּאָה לְזָר שֶׁאֵינוֹ אָחִיו, וּמֵת, מֻתָּר לִשָּׂא צָרָתָהּ:

But if one of all of the Arayot (forbidden sexual partners) is married to another man (lit. foreign) who is not her brother(in-law), and he dies, it is permitted to marry his other wife.

Se’if 3ג׳

יְבָמָה שֶׁהִיא סְפֵק עֶרְוָה עַל בַּעְלָהּ, אוֹ סְפֵק עֶרְוָה עַל הַיָּבָם, הֲרֵי זוֹ חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת. לְפִיכָךְ, מִי שֶׁקִּדֵּשׁ אִשָּׁה בִּסְפֵק קִדּוּשִׁין, וְאַחַר כָּךְ מֵת אָחִיו שֶׁהָיָה נוֹשֵׂא אֲחוֹתָהּ, וְנָפְלָה לוֹ לְיִבּוּם, שֶׁהִיא סְפֵק אֲחוֹת אִשְׁתּוֹ, הֲרֵי זוֹ חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת, וּמוֹצִיא אֶת אִשְׁתּוֹ בְּגֵט מִסָפֵק, וּשְׁתֵּיהֶן אֲסוּרוֹת עָלָיו; יְבִמְתּוֹ, מִפְּנֵי שֶׁהִיא סְפֵק עֶרְוָה; וַאֲרוּסָתוֹ, מִפְּנֵי שֶׁהִיא סְפֵק קְרוֹבַת חֲלוּצָתוֹ:

A woman required to perform Yibum (Levirate Marriage) who is possibly a forbidden sexual partner (lit. doubt of nakedness) to her husband, or is possibly a forbidden sexual partner on her brother-in-law (lit. one with whom she is required to perfrom Yibum), behold she performs Chalitza (ceremony exempting one from performing Yibum) and does not perform Yibum. Therefore, he who betroths a woman where is a doubt if their marriage took effect, and afterward the brother dies who married his sister, and he performed (lit. fell into) Yibum, that there is a doubt she is the sister of his wife, here she performs Chalitza and not Yibum, and gives (lit. brings) his wife a Get (writ of divorce) from doubt, and the two of them are prohibited to him; and in his death, because she is possibly a forbidden sexual partner; and his fiancee, because she is possibly a relative of someone he must perform Chalitza with.