Then in Matthew 19:5-6 it says, “And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.” Here we see that marriage isn’t just something man made up, but something “God hath joined together.” At the appropriate age, He wants us to leave our parents and marry, becoming “one flesh” which can be interpreted as one entity. In the physical sense this means sexual intercourse, but in the spiritual sense this means loving each other and giving to each other.
A promise is one thing, but a convent is a promise that also involves God. In the Bible, we learn that marriage is a covenant. In Malachi 2:14, it says, “Yet ye say, Wherefore? Because the Lord hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant.” It clearly tells us that marriage is a covenant and that God is involved, in fact God is even a witness of the married couple. Marriage is important to Him, especially in how the spouses treat each other. In this particular set of verses, God is disappointed in how the wife was treated.
In the Bible we also learn that God does not look fondly on the non-marriage arrangement or “living together,” which further proves that marriage itself involves making actually promises. In John 4 we read of the woman at the well and her lack of a current husband, though she is living with a man. In verses 16-18 it says, “Jesus saith unto her, Go, call thy husband, and come hither. The woman answered and said, I have no husband. Jesus said unto her, Thou hast well said, I have no husband: For thou hast had five husbands; and he whom thou now hast is not thy husband: in that saidst thou truly.” What Jesus is saying is that living together isn’t the same as marriage; in fact marriage must be the result of a covenant or marriage ceremony.