They have taken some of the women from these nations as wives for themselves and their sons, so that the holy seed has assimilated to the peoples of the lands; moreover, the officials and leaders have been the main offenders in this treachery.”
Ezra 9:2

Then Shekaniah son of Jehiel, one of the descendants of Elam, said to Ezra, “We have been unfaithful to our God by marrying foreign women from the peoples around us. But in spite of this, there is still hope for Israel.

Ezra 10:2

Now let us make a covenant before our God to send away all these women and their children, in accordance with the counsel of my Lord and of those who fear the commands of our God.
Let it be done according to the Law.

Ezra 10:3