In the Book of Ezra, Jews who intermarried with foreign wives responded to Ezra's message by determining to divorce their wives and also to send away any children produced by the marriage:
Ezra 10
We have indeed betrayed our God by taking as wives foreign women of the peoples of the land. Yet in spite of this there still remains a hope for Israel. 3 Let us therefore enter into a covenant before our God to dismiss all our foreign wives and the children born of them, in keeping with what you, my lord, advise, and those who are in dread of the commandments of our God. Let it be done according to the law! 4 Rise, then, for this is your duty!
But in Malachi 2:14-16 we read:
the Lord is witness between you and the wife of your youth with whom you have broken faith, though she is your companion, your covenanted wife. Did he not make them one, with flesh and spirit? And what does the One require? Godly offspring! You should be on guard, then, for your life, and do not break faith with the wife of your youth. 16 For I hate divorce, says the Lord, the God of Israel.
One way of reading Malachi is to understand that he is urging the Jews not to take Ezra's teaching too far: as long as the foreign wife has converted to Judaism, God wants the couple to stay together and raise 'godly offspring.' Another way is to interpret Malachi as teaching that there is no such thing as a "covenanted wife" unless the woman is Jewish. Are there other scriptures that can help us understand Malachi and Ezra's teaching here? How absolute was the Ezra's policy? Were there no exceptions if the woman was willing to raise their children as Jews?