Deuteronomy 22:23

ומצאה איש בעיר [IF A DAMSEL THAT IS A VIRGIN BE BETROTHED UNTO A MAN] AND A MAN FIND HER IN THE CITY [AND LIE WITH HER] — (Because he found her outdoors) therefore he lay with her: a breach in the wall invites the thief; if she had remained at home (as becomes a chaste Jewish girl) this would not have happened to her (Sifrei Devarim 242:2-3).

כִּ֤י יִהְיֶה֙ נַעֲרָ֣ בְתוּלָ֔ה מְאֹרָשָׂ֖ה לְאִ֑ישׁ וּמְצָאָ֥הּ אִ֛ישׁ בָּעִ֖יר וְשָׁכַ֥ב עִמָּֽהּ׃

If a girl that is a virgin be betrothed to a husband, and a man find her in the city, and lie with her;