Deuteronomy 23:3-4

3No Ammonite or Moabite or any of their descendants may enter the assembly of the LORD, not even in the tenth generation. 4For they did not come to meet you with bread and water on your way when you came out of Egypt, and they hired Balaam son of Beor from Pethor in Aram Naharaim That is, Northwest Mesopotamia to pronounce a curse on you.