כָּל־אֵ֕לֶּה נשאי [נָשְׂא֖וּ] נָשִׁ֣ים נָכְרִיּ֑וֹת וְיֵ֣שׁ מֵהֶ֣ם נָשִׁ֔ים וַיָּשִׂ֖ימוּ בָּנִֽים׃ (פ)
All these had taken foreign wives; and some of them had wives by whom they had children.
Read midrashic interpretation of Ezra 10:44: and classical rabbinic exegesis.