Deuteronomy 21:17

17He must acknowledge the firstborn, the son of the unloved wife, by giving him two shares
Lit mouth of two, or two mouthfuls
Or two-thirds; the two-thirds interpretation holds that the firstborn son receives two-thirds of the total estate no matter how many sons are in the family.
of his estate, for he is the firstfruits of his virility; he has the rights of the firstborn. c

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