הָאֲרוּסָה אֲסוּרָה לְבַעְלָהּ מִדִּבְרֵי סוֹפְרִים כָּל זְמַן שֶׁהִיא בְּבֵית אָבִיהָ. וְהַבָּא עַל אֲרוּסָתוֹ בְּבֵית חָמִיו מַכִּין אוֹתוֹ מַכַּת מַרְדּוּת. וַאֲפִלּוּ אִם קִדְּשָׁהּ בְּבִיאָה אָסוּר לוֹ לָבוֹא עָלֶיהָ בִּיאָה שְׁנִיָּה בְּבֵית אָבִיהָ עַד שֶׁיָּבִיא אוֹתָהּ לְתוֹךְ בֵּיתוֹ וְיִתְיַחֵד עִמָּהּ וְיַפְרִישֶׁנָּהּ לוֹ. וְיִחוּד זֶה הוּא הַנִּקְרָא כְּנִיסָה לַחֻפָּה וְהוּא הַנִּקְרָא נִשּׂוּאִין בְּכָל מָקוֹם. וְהַבָּא עַל אֲרוּסָתוֹ לְשֵׁם נִשּׂוּאִין אַחַר שֶׁקִּדְּשָׁהּ מִשֶּׁיְּעָרֶה בָּהּ קְנָאָהּ וְנַעֲשֵׂית נְשׂוּאָה וַהֲרֵי הִיא אִשְׁתּוֹ לְכָל דָּבָר:
An engaged woman (arusa) is forbidden to her husband by rabbinic law so long as she is in her father's house. He [the husband] who sleeps with his fiancee in his father-in-law's house is lashed for rebellion (against rabbinic decrees). Even if he engaged her (kiddushin) through sexual intercourse, he is nevertheless forbidden from sleeping with her in her father's house until he brings her into his house and is alone with her and separates her for himself. This seclusion is the stage of "chuppa" and it is "nisuin" for all intents and purposes. One who sleeps with his finacee for the sake of nisuin after kiddushin is married to her in all regards after the initial stage of intercourse (penetration).
