Mishnayos Yevamos Perek 15 Mishnah 5

If two women who were married to the same man come forward, and one of them says that the husband died, and the other one says he did not die, the one who says he died may marry on the basis of her own testimony, and she takes the money of her marriage contract. And the one who said he did not die may not marry, and does not take the money of her marriage contract. If one wife says: He died in a normal manner, and the other one says: He was killed, Rabbi Meir says: Since they contradict one another, these women may not marry. Rabbi Yehuda and Rabbi Shimon say: Since they both agree that he is not alive they may marry, despite the fact that they dispute the circumstances of his demise. If a witness says: He died, and a witness says: He did not die, or one woman says: He died, and another woman says: He did not die, this woman may not marry.

אַחַת אוֹמֶרֶת מֵת וְאַחַת אוֹמֶרֶת לֹא מֵת, זוֹ שֶׁאוֹמֶרֶת מֵת תִּנָּשֵׂא וְתִטֹּל כְּתֻבָּתָהּ. וְזוֹ שֶׁאוֹמֶרֶת לֹא מֵת לֹא תִנָּשֵׂא וְלֹא תִטֹּל כְּתֻבָּתָהּ. אַחַת אוֹמֶרֶת מֵת וְאַחַת אוֹמֶרֶת נֶהֱרָג, רַבִּי מֵאִיר אוֹמֵר, הוֹאִיל וּמַכְחִישׁוֹת זוֹ אֶת זוֹ, הֲרֵי אֵלּוּ לֹא יִנָּשֵׂאוּ. רַבִּי יְהוּדָה וְרַבִּי שִׁמְעוֹן אוֹמְרִים, הוֹאִיל וְזוֹ וָזוֹ מוֹדוֹת שֶׁאֵינוֹ קַיָּם, יִנָּשֵׂאוּ. עֵד אוֹמֵר מֵת וְעֵד אוֹמֵר לֹא מֵת, אִשָּׁה אוֹמֶרֶת מֵת וְאִשָּׁה אוֹמֶרֶת לֹא מֵת, הֲרֵי זוֹ לֹא תִנָּשֵׂא: