Nehemiah 13:1-3

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.