What is the meaning of Malachi 2:15?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

Has not the LORD made them one, having a portion of the Spirit? And why one? Because He seeks godly offspring. So guard yourselves in your spirit and do not break faith with the wife of your youth.

Berean Standard Bible (BSB)

Did he not make you one, although he had the residue of the Spirit? Why one? He sought a godly seed. Therefore take heed to your spirit, and let no one deal treacherously against the wife of his youth.

World English Bible (WEB)

And did not he make{H6213}{(H8804)} one{H259}? Yet had he the residue{H7605} of the spirit{H7307}. And wherefore one{H259}? That he might seek{H1245}{(H8764)} a godly{H430} seed{H2233}. Therefore take heed{H8104}{(H8738)} to your spirit{H7307}, and let none deal treacherously{H898}{(H8799)} against the wife{H802} of his youth{H5271}.

Strong's King James

(15) Did He not make them one together who have a remainder of רוּחַ Ruach-Spirit? And why one? He's searching for seed for אֱלֹהִים Elohim! Watch then in your ruach-spirit and let none deal treacherously against the wife of your youth.

The F.O.G*

The F.O.G Paraphrase

And He did not make one only, And He hath the remnant of the Spirit. And what is the one alone! He is seeking a godly seed. And ye have been watchful over your spirit, And with the wife of thy youth, None doth deal treacherously.

Young's Literal Translation