Deuteronomy 23:1-4

1A man with crushed or severed genitals may not enter the assembly of the Lord.

2A person of illegitimate birth may not enter the assembly of the Lord; to the tenth generation no one related to him may do so.

3An Ammonite or Moabite may not enter the assembly of the Lord; to the tenth generation none of their descendants shall ever do so,

4for they did not meet you with food and water on the way as you came from Egypt, and furthermore, they hired Balaam son of Beor of Pethor in Aram Naharaim to curse you.