Ketubot 12a
כתובות י״ב א — ד"ה מַתְנִי׳ הָאוֹכֵל אֵצֶל חָמִיו בִּיהוּדָה שֶׁלֹּא
Ketubot 12a:7
A man who eats at his betrothed's father's house in Judea without witnesses becomes unable to claim virginity after marriage, because the local custom assumes he secluded himself with her and may have engaged in intercourse; the passage notes that custom varied by location, as in Judea the groom and bride were intentionally secluded together briefly before the wedding canopy to acclimate them to each other, while in Galilee this was not done.
מַתְנִי׳ הָאוֹכֵל אֵצֶל חָמִיו בִּיהוּדָה שֶׁלֹּא בְּעֵדִים — אֵינוֹ יָכוֹל לִטְעוֹן טַעֲנַת בְּתוּלִים, מִפְּנֵי שֶׁמִּתְיַיחֵד עִמָּהּ. גְּמָ׳ מִדְּקָתָנֵי ״הָאוֹכֵל״, מִכְּלָל דְּאִיכָּא דּוּכְתָּא בִּיהוּדָה נָמֵי דְּלָא אָכֵיל. אָמַר אַבָּיֵי: שְׁמַע מִינַּהּ בִּיהוּדָה נָמֵי מְקוֹמוֹת מְקוֹמוֹת יֵשׁ. כִּדְתַנְיָא, אָמַר רַבִּי יְהוּדָה: בִּיהוּדָה, בָּרִאשׁוֹנָה הָיוּ מְיַיחֲדִין אֶת הֶחָתָן וְאֶת הַכַּלָּה שָׁעָה אַחַת קוֹדֶם כְּנִיסָתָן לַחוּפָּה, כְּדֵי שֶׁיְּהֵא לִבּוֹ גַּס בָּהּ, וּבַגָּלִיל לֹא הָיוּ עוֹשִׂין כֵּן.
MISHNA: A man who eats at the house of his father-in-law in Judea after betrothal and without witnesses to attest to the fact that he was not alone with his betrothed is unable to make a claim concerning virginity after marriage because in accordance with the custom in Judea, the assumption is that he secluded himself with her, and the concern is that it was he who engaged in intercourse with her. GEMARA: The Gemara infers: From the fact that the mishna teaches the halakha employing the phrase: A man who eats, by inference one may conclude that there is also a place in Judea where the groom does not eat at the house of his father-in-law, and does not enter into seclusion with his betrothed. Abaye said: Conclude from it that in Judea too there are different places with different customs, as it is taught in a baraita that Rabbi Yehuda said: In Judea, at first they would seclude the groom and bride together for a brief period before their entry into the wedding canopy, so that he would grow accustomed to her companionship in order to ease the awkwardness when they would consummate the marriage. And in the Galilee they did not do so.