171 Yevamot 15/1-2

(א) הָאִשָּׁה שֶׁהָלְכָה הִיא וּבַעְלָהּ לִמְדִינַת הַיָּם, שָׁלוֹם בֵּינוֹ לְבֵינָהּ וְשָׁלוֹם בָּעוֹלָם, וּבָאתָה וְאָמְרָה, מֵת בַּעְלִי, תִּנָּשֵׂא. מֵת בַּעְלִי, תִּתְיַבֵּם. שָׁלוֹם בֵּינוֹ לְבֵינָהּ וּמִלְחָמָה בָעוֹלָם, קְטָטָה בֵינוֹ לְבֵינָהּ וְשָׁלוֹם בָּעוֹלָם, וּבָאתָה וְאָמְרָה, מֵת בַּעְלִי, אֵינָהּ נֶאֱמֶנֶת. רַבִּי יְהוּדָה אוֹמֵר, לְעוֹלָם אֵינָהּ נֶאֱמֶנֶת, אֶלָּא אִם כֵּן בָּאתָה בוֹכָה וּבְגָדֶיהָ קְרוּעִין. אָמְרוּ לוֹ, אַחַת זוֹ וְאַחַת זוֹ, תִּנָּשֵׂא:

(ב) בֵּית הִלֵּל אוֹמְרִים, לֹא שָׁמַעְנוּ אֶלָּא בְּבָאָה מִן הַקָּצִיר, וּבְאוֹתָהּ מְדִינָה, וּכְמַעֲשֶׂה שֶׁהָיָה. אָמְרוּ לָהֶן בֵּית שַׁמַּאי, אַחַת הַבָּאָה מִן הַקָּצִיר, וְאַחַת הַבָּאָה מִן הַזֵּיתִים, וְאַחַת הַבָּאָה מִן הַבָּצִיר, וְאַחַת הַבָּאָה מִמְּדִינָה לִמְדִינָה. לֹא דִבְּרוּ חֲכָמִים בַּקָּצִיר אֶלָּא בַהֹוֶה. חָזְרוּ בֵית הִלֵּל לְהוֹרוֹת כְּבֵית שַׁמָּאי:

(1) [If] a woman and her husband went overseas and there was peace between them and peace in the world, and she came and said, "My husband died", she may marry. [If she said], "My husband died" she may undergo Yibum [Levirate marriage wherein a man weds his childless brother's widow]. [If] there was peace between them and war in the world, [or] strife between them and peace in the world, and she came and said, "My husband died", she is not trusted. Rabbi Yehudah says: She is only trusted if she comes crying and in torn clothes. They [the Sages] said to him: She may marry in either case.

(2) Beit Hillel say: We have heard that this [that she may re-marry upon reporting her husband's death] only applies if she comes from the harvest, and within the same country, and like a case that happened. Beit Shammai said to them: [She may re-marry] whether she comes from the harvest or from the olive [harvest] or from the grape [harvest], or whether she comes from a different country - the Sages only spoke of the harvest since that was what happened. And Beit Hillel retracted to teach according to Beit Shammai.