Kesuvos1: 6
הַנּוֹשֵׂא אֶת הָאִשָּׁה וְלֹא מָצָא לָהּ בְּתוּלִים, הִיא אוֹמֶרֶת: ,,מִשֶּׁאֵרַסְתַּנִי נֶאֱנַסְתִּי, וְנִסְתַּחֲפָה שָׂדֶךָ”; וְהַלָּה אוֹמֵר: ,,לֹא כִי, אֶלָּא עַד שֶׁלֹּא אֵרַסְתִּיךְ, וְהָיָה מִקָּחִי מִקַּח טָעוּת” — רַבָּן גַּמְלִיאֵל וְרַבִּי אֱלִיעֶזֶר אוֹמְרִים: נֶאֱמֶנֶת. רַבִּי יְהוֹשֻׁעַ אוֹמֵר: לֹא מִפִּיהָ אָנוּ חַיִּין. אֶלָּא הֲרֵי זוֹ בְּחֶזְקַת בְּעוּלָה עַד שֶׁלֹּא תִתְאָרֵס, וְהִטְעַתּוּ, עַד שֶׁתָּבִיא רְאָיָה לִדְבָרֶיהָ.
[If] one marries a woman and does not find [any tokens of] virginity —- she says: “After you betrothed me, I was violated, and your misfortune caused it”; and the other one says: “Not so, [it happened] before I betrothed you, and my acquisition was made in error” —- Rabban Gamliel and R’ Eliezer say: She is believed. R’ Yehoshua [however] says: She is not believed. Rather, it is presumed that she was a nonvirgin before she was betrothed, and [that] she misled him, until she proves her claim.
Kesuvos1: 7
הִיא אוֹמֶרֶת: ,,מֻכַּת עֵץ אֲנִי”, וְהוּא אוֹמֵר: ,,לֹא כִי, אֶלָּא דְּרוּסַת אִישׁ אַתְּ” — רַבָּן גַּמְלִיאֵל וְרַבִּי אֱלִיעֶזֶר אוֹמְרִים: נֶאֱמֶנֶת. וְרַבִּי יְהוֹשֻׁעַ אוֹמֵר: לֹא מִפִּיהָ אָנוּ חַיִּין. אֶלָּא הֲרֵי זוֹ בְּחֶזְקַת דְּרוּסַת אִישׁ, עַד שֶׁתָּבִיא רְאָיָה לִדְבָרֶיהָ.
[If] she says: “I was injured by a piece of wood,” and he says: “Not so, but you were deflowered by a man” —- Rabban Gamliel and R’ Eliezer say: She is believed. R’ Yehoshua, however, says: She is not believed. Rather, it is presumed that she had been de-flowered by a man, until she proves her claim.