Nehemiah 13:1-3

1At that time the book of Moses was read publicly to the people. The command was found written in it that no Ammonite or Moabite should ever enter the assembly of God,

2because they did not meet the Israelites with food and water. Instead, they hired Balaam against them to curse them, but our God turned the curse into a blessing.

3When they heard the law, they separated all those of mixed descent from Israel.