Nehemiah 13:20-24

So the merchants and sellers of all kind of ware lodged without Jerusalem once or twice.

Then I testified against them, and said unto them, Why lodge ye about the wall? if ye do so again, I will lay hands on you. From that time forth came they no more on the sabbath.

And I commanded the Levites that they should cleanse themselves, and that they should come and keep the gates, to sanctify the sabbath day. Remember me, O my God, concerning this also, and spare me according to the greatness of thy mercy.

In those days also saw I Jews that had married wives of Ashdod, of Ammon, and of Moab:

And their children spake half in the speech of Ashdod, and could not speak in the Jews’ language, but according to the language of each people.