Deuteronomy 21:15-17

Modern English Version

The Right of the Firstborn

¹⁵ If a man has two wives, one beloved and another unloved, and both have borne him children, both the loved one and the unloved one, and if the firstborn son is hers that is unloved, ¹⁶ then it must be, when he gives his sons the inheritance which he has, that he may not make the firstborn son of the loved come before the son of the unloved, who was indeed the firstborn. ¹⁷ On the contrary, he must acknowledge the son of the unloved for the firstborn, by giving him a double portion of all that he has, for he is the beginning of his strength. The right of the firstborn is his.