178 Yevamot 16/4-5

(ד) נָפַל לְמַיִם, בֵּין שֶׁיֵּשׁ לָהֶן סוֹף, בֵּין שֶׁאֵין לָהֶן סוֹף, אִשְׁתּוֹ אֲסוּרָה. אָמַר רַבִּי מֵאִיר, מַעֲשֶׂה בְאֶחָד שֶׁנָּפַל לְבוֹר הַגָּדוֹל, וְעָלָה לְאַחַר שְׁלֹשָׁה יָמִים. אָמַר רַבִּי יוֹסֵי, מַעֲשֶׂה בְסוּמָא שֶׁיָּרַד לִטְבֹּל בִּמְעָרָה, וְיָרַד מוֹשְׁכוֹ אַחֲרָיו, וְשָׁהוּ כְדֵי שֶׁתֵּצֵא נַפְשָׁם, וְהִשִּׂיאוּ נְשׁוֹתֵיהֶם. וְשׁוּב מַעֲשֶׂה בְעַסְיָא בְּאֶחָד שֶׁשִּׁלְשְׁלוּהוּ לַיָּם, וְלֹא עָלָה בְיָדָם אֶלָּא רַגְלוֹ, אָמְרוּ חֲכָמִים, מִן הָאַרְכֻּבָּה וּלְמַעְלָה, תִּנָּשֵׂא. מִן הָאַרְכֻּבָּה וּלְמַטָּה, לֹא תִנָּשֵׂא:

(ה) אֲפִלּוּ שָׁמַע מִן הַנָּשִׁים אוֹמְרוֹת, מֵת אִישׁ פְּלוֹנִי, דַּיּוֹ. רַבִּי יְהוּדָה אוֹמֵר, אֲפִלּוּ שָׁמַע מִן הַתִּינוֹקוֹת אוֹמְרִים, הֲרֵי אָנוּ הוֹלְכִין לִסְפֹּד וְלִקְבֹר אֶת אִישׁ פְּלוֹנִי, בֵּין שֶׁהוּא מִתְכַּוֵּן וּבֵין שֶׁאֵינוֹ מִתְכַּוֵּן. רַבִּי יְהוּדָה בֶן בָּבָא אוֹמֵר, בְּיִשְׂרָאֵל עַד שֶׁיְּהֵא מִתְכַּוֵּן. וּבְגוֹי, אִם הָיָה מִתְכַּוֵּן, אֵין עֵדוּתוֹ עֵדוּת:

(4) [If] a man fell into the water his wife is forbidden [to re-marry] whether or not the [body of] water has a [visible] end. Rabbi Meir said: It once happened that a person fell into a large pit and he emerged after three days. Rabbi Yose said: It once happened that a blind man went down to immerse in a cave and his escort went down after him, and they remained long enough for their souls to depart, and their wives were permitted to marry. And another incident happened in Asya with an individual who was lowered to the sea and only his leg came up. The Sages said: [If they retrieved a leg which was severed] from the knee and above [his wife] may marry, [if the leg was] from the knee and below she may not marry.

(5) Even if one hears women saying, "So-and-so died", that is sufficient [as testimony]. Rabbi Yehudah says: Even if one hears children saying, "We are going to eulogize and bury So-and-so", that is sufficient [for him to then testify]. [This is so] whether he intends [to testify] or does not intend [to testify]. Rabbi Yehudah ben Bava says: [If] a Jew [repeats what he overheard] he must intend [to testify to permit his wife to marry]; [if] a gentile [repeats what he overheard] his testimony is no testimony if he intended to testify.