Numbers 36:5

5.And Moses commanded the children of Israel. The account here given is not identical with the previous one, that Moses referred the matter to God; yet the same thing is more briefly stated, viz., that Moses answered the people out of the mouth of God, from whence we infer that God was consulted by him. Moreover, God not only decides in favor of the children of Manasseh, but approves of their appeal, in that they were contented with their allotment, and claim for themselves what could not be alienated without the violation of the Divine decree. From this particular occasion, a general law is laid down, that no woman to whom an inheritance had fallen, was to marry out of her tribe, because she would defraud her own relatives of her marriage portion. In this way, however, a free permission to marry was accorded to females, provided they renounced their paternal inheritance. The words, indeed, seem to be of wider application, i e., that no man should marry a wife, except of his own kindred; but the meaning of the law is to be sought from the cause which led to its enactment. Moreover, there is no doubt but that promiscuous marriages are here forbidden, in so far as they confound the order of hereditary rights.