אבן העזר קנ״אEven HaEzer 151

Se’if 1א׳

כָּתַב הַסוֹפֵר הַשּׁוֹבָר וְהַגֵּט, וְטָעָה וְנָתַן הַשּׁוֹבָר לָאִישׁ, וְהַגֵּט לָאִשָּׁה, וְנָתְנוּם זֶה לָזֶה וְכִמְדֻמֶּה לָהֶם שֶׁנִּתְגָּרְשָׁה, וּלְאַחַר זְמַן עִרְעֵר הַבַּעַל לוֹמַר שֶׁלֹּא נִתְגָּרְשָׁה, שֶׁלֹּא נָתַן לָהּ אֶלָּא הַשּׁוֹבָר וַהֲרֵי הַגֵּט עֲדַיִן בְּיָדוֹ, אִם לֹא נִשֵּׂאת עֲדַיִן, נֶאֱמָן, וִיגָּרְשֶׁנָּה עַכְשָׁו וּתְהֵא מֻתֶּרֶת מֵעַתָּה. וְאִם לֹא גֵּרְשָׁהּ, וְעָמְדָה וְנִשֵּׂאת, תֵּצֵא מִזֶּה וּמִזֶּה, וְכָל הַי"ג דְּרָכִים בָּהּ. וְאִם לֹא עִרְעֵר הַבַּעַל עַד אַחַר שֶׁנִּשֵּׂאת, אֵינוֹ נֶאֱמָן לְאָסְרָהּ, וַהֲרֵי הִיא בְּחֶזְקַת גְּרוּשָׁה, שֶׁאָנוּ תּוֹלִין שֶׁנָּפַל מִמֶּנָּה וְהוּא מְצָאוֹ:

The scribe wrote the receipt [for divorce] and the divorce document, and made a mistake and gave the receipt to the man and the divorce document to the woman, and they gave them to each other and they were under the impression that they were divorced, and afterwards the husband objected to say she wasn't divorced, that he only gave her the receipt and the divorce document is still in his hands, if she didn't [re]marry yet, he's believed, and he should divorce her now and she will be permitted onwards. And if he didn't divorce her, and she gets up and [re]marries, she leaves this one and that one (first and second husbands), and all of the 13 ways [apply] to her. And if the husband did not object until after she [re]marries, he's not believed to forbid her, and she retains the status of a divorcee, since we "hang" [it] that [the divorce document] fell from her and he found it.