Related על קידושין 8:10

"and he cohabit with her." We are hereby taught that a woman is acquired by cohabitation. For (without this verse) it would follow otherwise, viz.: If a yevamah, who is not acquired by money, is acquired by cohabitation, then a woman, who is acquired by money, how much more so should she be acquired by cohabitation! — (No,) this is refuted by the instance of a Hebrew handmaid, who is acquired by money, but is not acquired by cohabitation. Do not wonder, then, if a woman, who, though she is acquired by money, were not to be acquired by cohabitation. It must, therefore, be written "and he cohabit with her," to teach that a woman is acquired by cohabitation.