הַיְבָמָה שֶׁנָּתַן לָהּ הַיָּבָם גֵּט כְּרִיתוּת פְּסָלָהּ וּפָסַל אֶת צָרוֹתֶיהָ עָלָיו וְעַל שְׁאָר הָאַחִין שֶׁהֲרֵי נַעֲשָׂה כְּמִי שֶׁחָלַץ לָהּ. וְאֵין הַגֵּט מוֹעִיל בִּיבָמָה אֶלָּא מִדִּבְרֵיהֶן הוֹאִיל וְהַגֵּט מְגָרֵשׁ אֵשֶׁת אִישׁ. וְכָל גֵּט שֶׁפּוֹסֵל אִשְׁתּוֹ מִן הַכְּהֻנָּה פּוֹסֵל אֶת יְבִמְתּוֹ מִן הַיִּבּוּם וְאֵינָהּ מֻתֶּרֶת לְזָר עַד שֶׁיַּחֲלֹץ לָהּ:
When a yavam gives a yevamah a bill of divorce (a get), he disqualifies her and all of [his deceased brother's] other wives [from performing yibbum] with him or with any of the other brothers. It is considered as if he has performed chalitzah with her. The power of a get to affect a yevamah is Rabbinic in origin. [They instituted this decree based on the following rationale:] Since a get has the power to bring about the divorce of a married woman, and every get causes a woman to be disqualified from the priesthood, [they decreed] that it should also disqualify a yevamah from performing yibbum. [The yevamah] is not permitted to marry another man, however, until she performs chalitzah.
