“Now make confession to Jehovah the God of your forefathers and do his will. Separate yourselves from the peoples of the land and from these foreign wives.”
~Ezra 10:11

Does the Jews sending their wives away violate the Bible viewpoint of marriage?
After all, this action directly contradicts Jesus’ words: “What God has yoked together, let no man put apart,” (Matt. 19:6).
But we need to keep in mind that Mosaic Law, written well over a thousand years before Jesus was even born, allowed for divorce, providing anything “indecent” be found in the wife (Deut. 24:1).
In Jewish culture, the husband who wished to divorce his wife had to provide a divorce certificate that legally freed her up to marry again.
Man and wife were originally united as “one flesh.”
That principle was instituted “from the beginning,” (Matt. 19:3-5).
But Jesus himself explains that the divorce provision was due to the hard-heartedness characteristic of men in his own culture.
Therefore, we cannot judge the actions of the pre-Christian men, who were tasked with reestablishing their religious customs, by modern day Christian standards.
The Jews had the express mission of reinstating pure worship so that the Messiah could be born to them, as had been promised to Abraham, Jacob, and King David (Gen. 22:18; 28:14; Isa. 9:7).
That was, in part, why the Mede and Persian rulers had supported their efforts to rebuild Jerusalem (Ez. 6:3,12; 7:21).
Their associations in the surrounding pagan nations distracted them.
They were in danger of adopting their foreign wives’ idolatrous practices and once again garnering God’s disaproval.
It was under these circumstances and three months of litigating on a case by case basis that the foreign wives were eventually sent away with full custody of the children they had borne (Ez. 10:16,17,44).
Christians, on the other hand, were to be composed of all nations, not just of Israeli descent, and are not to divorce unless one is the innocent victim of a marital affair (Matt. 19:9; 28:19; 1 Pet. 3:1,7).
So while it was imperative to the survival of the Jewish religion to send away the pagan wives, Christians cannot use their stand as a precedent to excuse themselves from their marriage dues.