17 He must acknowledge the son of his unloved wife as the firstborn by giving him a double share of all he has. That son is the first sign of his father’s strength. The right of the firstborn belongs to him.

Read Deuteronomy 21:17 Using Other Translations

But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
but he shall acknowledge the firstborn, the son of the unloved, by giving him a double portion of all that he has, for he is the firstfruits of his strength. The right of the firstborn is his.
He must recognize the rights of his oldest son, the son of the wife he does not love, by giving him a double portion. He is the first son of his father’s virility, and the rights of the firstborn belong to him.