Mishnayos Gittin Perek 7 Mishnah 9

If a husband said to others: If I do not come back from now until the conclusion of twelve months, write and give a bill of divorce to my wife, and they wrote a bill of divorce during the twelve months and gave it to her after twelve months had elapsed, it is not a valid bill of divorce because he instructed them to write the bill of divorce only after twelve months had elapsed. Similarly, if he said to others: Write and give a bill of divorce to my wife if I do not come back from now until the conclusion of twelve months, and they wrote it during the twelve months but gave it to her after the twelve months, it is not a valid bill of divorce because he instructed them to write the bill of divorce only after twelve months had elapsed, when it was clear that he did not come back. Rabbi Yosei disagrees and says: In a case like this, it is a valid bill of divorce, as he did not tell them when to write the bill of divorce. Rather, he stipulated only the time of giving. If they wrote the bill of divorce after twelve months had elapsed, and gave it after twelve months had elapsed, but in the interim the husband died, if the giving of the bill of divorce occurred before the husband’s death this is a valid bill of divorce. But if the husband’s death occurred before the giving of the bill of divorce it is not a valid bill of divorce. And if it is not known which occurred first, this is a case where the Sages said there is uncertainty whether she is divorced or whether she is not divorced.

אִם לֹא בָאתִי מִכָּאן עַד שְׁנֵים עָשָׂר חֹדֶשׁ כִּתְבוּ וּתְנוּ גֵט לְאִשְׁתִּי, כָּתְבוּ גֵט בְּתוֹךְ שְׁנֵים עָשָׂר חֹדֶשׁ וְנָתְנוּ לְאַחַר שְׁנֵים עָשָׂר חֹדֶשׁ, אֵינוֹ גֵט. כִּתְבוּ וּתְנוּ גֵט לְאִשְׁתִּי אִם לֹא בָאתִי מִכָּאן וְעַד שְׁנֵים עָשָׂר חֹדֶשׁ, כָּתְבוּ בְתוֹךְ שְׁנֵים עָשָׂר חֹדֶשׁ וְנָתְנוּ לְאַחַר שְׁנֵים עָשָׂר חֹדֶשׁ, אֵינוֹ גֵט. רַבִּי יוֹסֵי אוֹמֵר, כָּזֶה גֵּט. כָּתְבוּ לְאַחַר שְׁנֵים עָשָׂר חֹדֶשׁ וְנָתְנוּ לְאַחַר שְׁנֵים עָשָׂר חֹדֶשׁ וּמֵת, אִם הַגֵּט קָדַם לַמִּיתָה, הֲרֵי זֶה גֵט. וְאִם מִיתָה קָדְמָה לַגֵּט, אֵינוֹ גֵט. וְאִם אֵין יָדוּעַ, זוֹ הִיא שֶׁאָמְרוּ, מְגֹרֶשֶׁת וְאֵינָהּ מְגֹרָשֶׁת: