Malachi 2:15

15 Has not the one God made you? You belong to him in body and spirit. And what does the one God seek? Godly offspring.a So be on your guard, and do not be unfaithful to the wife of your youth.

Read Malachi 2:15 Using Other Translations

And did not he make one? Yet had he the residue of the spirit. And wherefore one? That he might seek a godly seed. Therefore take heed to your spirit, and let none deal treacherously against the wife of his youth.
Did he not make them one, with a portion of the Spirit in their union? And what was the one God seeking? Godly offspring. So guard yourselves in your spirit, and let none of you be faithless to the wife of your youth.
Didn’t the LORD make you one with your wife? In body and spirit you are his. And what does he want? Godly children from your union. So guard your heart; remain loyal to the wife of your youth.