NUMBERS 36
After God instituted the inheritance rules for women (in response to the request of Zelophehad’s daughters), the family heads of their tribe came to Moses with a concern over the "unintended consequences" of such a rule. They were concerned that if the women married men from another tribe, the land would become the property of their husbands, thereby passing the land from one tribe to another. Theoretically, over time, one or two tribes could potentially amass a good deal of land through marriage.