Nehemiah 13:23-25

²³In those days I also saw the Jews who had married women of Ashdod, of Ammon, and of Moab;

²⁴and their children spoke half in the speech of Ashdod, and could not speak in the Jews’ language, but according to the language of each people.

²⁵I contended with them, cursed them, struck certain of them, plucked off their hair, and made them swear by God, “You shall not give your daughters to their sons, nor take their daughters for your sons, or for yourselves.