Reference for Yevamot 15:8

הָאִשָּׁה שֶׁהָלְכָה הִיא וּבַעְלָהּ לִמְדִינַת הַיָּם וּבְנָהּ עִמָּהֶם, וּבָאָה וְאָמְרָה מֵת בַּעְלִי וְאַחַר כָּךְ מֵת בְּנִי, נֶאֱמֶנֶת. מֵת בְּנִי וְאַחַר כָּךְ מֵת בַּעְלִי, אֵינָהּ נֶאֱמֶנֶת, וְחוֹשְׁשִׁים לִדְבָרֶיהָ, וְחוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת:

If a woman and her husband went abroad, their son with them, and she returned and said: My husband died and then my son died, she is believed. [Since she had a son, and was not in a status of (potential) yibum linkage when she left, now, too, when she says: My husband died and then my son died, claiming not to have yibum linkage, she is believed.] (But if she said:) My son died and then my husband died, [desiring to be taken in yibum], she is not believed. And [if she wishes to marry "in the marketplace" (i.e., outside of yibum)], we are apprehensive of her words, [for she had declared herself to be forbidden to others]; and she receives chalitzah and is not taken in yibum.

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