Matthew 19:3-6

And Pharisees came to Jesus, testing Him and asking, “Is it lawful for a man to divorce his wife for just any reason?” He replied, “Have you never read that He who created them from the beginning MADE THEM MALE AND FEMALE, and said, ‘FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER AND SHALL BE JOINED INSEPARABLY TO HIS WIFE, AND THE TWO SHALL BECOME ONE FLESH’? [Gen 1:27; 2:24; Mark 10:7] So they are no longer two, but one flesh. Therefore, what God has joined together, let no one separate.”