Numbers 26:5-7

5 aReuben, the firstborn of Israel; the sons of Reuben: of Hanoch, the clan of the Hanochites; of Pallu, the clan of the Palluites; 6of Hezron, the clan of the Hezronites; of Carmi, the clan of the Carmites. 7These are the clans of the Reubenites, and those listed were b43,730.
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