Joshua 23:12 Midrash

כִּ֣י ׀ אִם־שׁ֣וֹב תָּשׁ֗וּבוּ וּדְבַקְתֶּם֙ בְּיֶ֙תֶר֙ הַגּוֹיִ֣ם הָאֵ֔לֶּה הַנִּשְׁאָרִ֥ים הָאֵ֖לֶּה אִתְּכֶ֑ם וְהִֽתְחַתַּנְתֶּ֥ם בָּהֶ֛ם וּבָאתֶ֥ם בָּהֶ֖ם וְהֵ֥ם בָּכֶֽם׃

Else if ye do in any wise go back, and cleave unto the remnant of these nations, even these that remain among you, and make marriages with them, and go in unto them, and they to you;