'Wife' in the Bible

Yet you ask, "For what reason?' Because the LORD acts as a witness between you and the wife of your youth, because you were unfaithful to her, your partner, the wife of your covenant.

Did he not make them one? And the vestige of the spirit remains in him. And why did he make them one? He was seeking godly offspring. So guard yourselves in your spirit, and don't be unfaithful to the wife of your youth.