What is the meaning of Deuteronomy 21:17?

* The two F.O.G. Bibles below are currently in progress. What is the F.O.G?

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.

Berean Standard Bible (BSB)

but he shall acknowledge the firstborn, the son of the hated, 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.

World English Bible (WEB)

But he shall acknowledge{H5234}{(H8686)} the son{H1121} of the hated{H8130}{(H8803)} for the firstborn{H1060}, by giving{H5414}{(H8800)} him a double{H8147} portion{H6310} of all that he hath{H4672}{(H8735)}: for he is the beginning{H7225} of his strength{H202}; the right{H4941} of the firstborn{H1062} is his.

Strong's King James

The F.O.G*

The F.O.G Paraphrase

But the first-born, son of the hated one, he doth acknowledge, to give to him a double portion of all that is found with him, for he is the beginning of his strength; to him is the right of the first-born.

Young's Literal Translation