Nehemiah 13:1-3

1On that day they read in the book of Moses in the audience of the people; and therein was found written, that an Ammonite and a Moabite should not enter into the assembly of God for ever;

2because they met not the children of Israel with bread and with water, but hired Balaam against them, to curse them: howbeit our God turned the curse into a blessing.

3And it came to pass, when they had heard the law, that they separated from Israel all the mixed multitude.