Reference for Gittin 8:7
הַכּוֹנֵס אֶת יְבִמְתּוֹ וְהָלְכָה צָרָתָהּ וְנִשֵּׂאת לְאַחֵר וְנִמְצְאָה זֹאת שֶׁהִיא אַיְלוֹנִית, תֵּצֵא מִזֶּה וּמִזֶּה וְכָל הַדְּרָכִים הָאֵלּוּ בָהּ:
If one wed his yevamah and her tzarah went and remarried, [the ruling being that cohabitation with the one (the yevamah) exempts the tzarah (from chalitzah)], and she [the yevamah] were found to be an eilonith, [so that her yibum is not yibum, and the tzarah should not have been exempt], she leaves this one [her husband] and this one [her original yavam], and all of the above applies.
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