Deuteronomy 23:1-3 NIV

[1] No one who has been emasculated by crushing or cutting may enter the assembly of the LORD. [2] No one born of a forbidden marriage nor any of their descendants may enter the assembly of the LORD, not even in the tenth generation. [3] No Ammonite or Moabite or any of their descendants may enter the assembly of the LORD, not even in the tenth generation.