'Wherefore' in the Bible

Yet ye say, Wherefore? Because Jehovah hath been a witness between thee and the wife of thy youth, against whom thou hast dealt unfaithfully: yet is she thy companion, and the wife of thy covenant.

And did not one make them? and the remnant of the Spirit was his. And wherefore the one? He sought a seed of God. Take heed then to your spirit, and let none deal unfaithfully against the wife of his youth,