Numbers 36:7-9

Douay-Rheims 1899 American Edition

⁷ Lest the possession of the children of Israel be mingled from tribe to tribe. For all men shall marry wives of their own tribe and kindred:

⁸ And all women shall take husbands of the same tribe: that the inheritance may remain in the families,

⁹ And that the tribes be not mingled one with another, but remain so