Deuteronomy 23:2-3

23:2 A person of illegitimate birth may not enter the assembly of the Lord; to the tenth generation no one related to him may do so.

23:3 An Ammonite or Moabite may not enter the assembly of the Lord; to the tenth generation none of their descendants shall ever do so,

Deuteronomy 23:8

23:8 Children of the third generation born to them may enter the assembly of the Lord.