Nehemiah 13
23 Ref In those days also saw I the Jews that had married women of Ashdod, of Ammon, `and' of Moab:
24 Ref 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.
25 Ref And I contended with them, and cursed them, and smote certain of them, and plucked off their hair, and made them swear by God, `saying', Ye shall not give your daughters unto their sons, nor take their daughters for your sons, or for yourselves.