Nehemiah 13:1-3, 23-26

On that day they read aloud from the book of Moses so that the people could hear [its words], and in it was found written that no Ammonite or Moabite could ever enter the assembly of God, because they did not meet the Israelites with bread and water, but hired Balaam against them to curse them. Yet our God turned the curse into a blessing. [Num 22:3-11; Deut 23:5, 6] When the Jews heard the law, they separated from Israel all who were of foreign descent.

In those days I also saw Jews who had married women from Ashdod, Ammon, and Moab. As for their children, half spoke in the language of Ashdod, and none of them knew how to speak [Hebrew] the language of Judah, but only the language of his own people. So I contended with them and cursed them and struck some of them and pulled out their hair, and made them swear by God, saying, “You shall not give your daughters [in marriage] to their sons, nor take [any of] their daughters for your sons or for yourselves. Did not Solomon king of Israel sin [greatly against God] regarding these things? Yet among the many nations there was no king like him. He was loved by his God, and God made him king over all Israel; nevertheless the foreign women caused even him to sin [by turning to other gods and so, judged by God, he lost his kingdom]. [1 Kin 11:1-11]