Numbers 36:6-9

6This is what the Lord commands concerning the daughters of Zelophehad: ‘Let them marry whom they think best, aonly they shall marry within the clan of the tribe of their father. 7The inheritance of the people of Israel shall not be transferred from one tribe to another, for every one of the people of Israel bshall hold on to the inheritance of the tribe of his fathers. 8And cevery daughter who possesses an inheritance in any tribe of the people of Israel shall be wife to one of the clan of the tribe of her father, so that every one of the people of Israel may possess the inheritance of his fathers. 9So no inheritance shall be transferred from one tribe to another, for each of the tribes of the people of Israel shall hold on to its own inheritance.’”

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