Deuteronomy 23:3 in the King James Version
An Ammonite or Moabite shall not enter into the congregation of the LORD; even to their tenth generation shall they not enter into the congregation of the LORD for ever:
Context
2 A person born of a forbidden union shall not enter into the LORD’s assembly; even to the tenth generation shall no one of his enter into the LORD’s assembly.
3 An Ammonite or a Moabite shall not enter into the LORD’s assembly; even to the tenth generation shall no one belonging to them enter into the LORD’s assembly forever,
4 because they didn’t meet you with bread and with water on the way when you came out of Egypt, and because they hired against you Balaam the son of Beor from Pethor of Mesopotamia, to curse you.