Nehemiah 13:1-2

On that day there was a reading from the book of Moses in the hearing of the people; and they saw that it said in the book that no Ammonite or Moabite might ever come into the meeting of God; Because they did not give the children of Israel bread and water when they came to them, but got Balaam to put a curse on them: though the curse was turned into a blessing by our God.