In the New Testament, Jesus reestablished the indissolubility
and unity of marriage.
Matthew 19:3-9
Some Pharisees approached him, and tested him,
saying, "Is it lawful for a man to divorce his wife for any
cause whatever?" He said in reply, "Have you not read
that from the beginning the Creator 'made them male
and female' and said, 'For this reason a man shall leave
his father and mother and be joined to his wife, and the
two shall become one flesh'? So they are no longer two,
but one flesh. Therefore, what God has joined together,
no human being must separate."  …