In those days I also saw Jews who had married women of Ashdod, Ammon, and Moab.
Nehemiah 13:23
Surrounding context
13:22 And I commanded the Levites that they should cleanse themselves, and that they should go and guard the gates, to sanctify the Sabbath day. Remember me, O my God, concerning this also, and spare me according to the greatness of Your mercy!
13:23 In those days I also saw Jews who had married women of Ashdod, Ammon, and Moab.
13:24 And half of their children spoke the language of Ashdod, and could not speak the language of Judah, but spoke according to the language of one or the other people.