Parallel
Deuteronomy 21:17
Brenton's English Septuagint · Berean Standard Bible
But he shall acknowledge the first-born of the hated one to give to him double of all things which shall be found by him, because he is the first of his children, and to him belongs the birthright.
Instead, he must acknowledge the firstborn, the son of his unloved wife, by giving him a double portion of all that he has. For that son is the firstfruits of his father’s strength; the right of the firstborn belongs to him.