Deuteronomy 23:3

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 23:1

Purity in Public Worship

23:1 A man with crushed or severed genitals may not enter the assembly of the Lord.

Deuteronomy 11:1

Reiteration of the Call to Obedience

11:1 You must love the Lord your God and do what he requires; keep his statutes, ordinances, and commandments at all times.

Nehemiah 13:1

Further Reforms by Nehemiah

13:1 On that day the book of Moses was read aloud in the hearing of the people. They found written in it that no Ammonite or Moabite may ever enter the assembly of God,

Nehemiah 13:26

13:26 Was it not because of things like these that King Solomon of Israel sinned? Among the many nations there was no king like him. He was loved by his God, and God made him king over all Israel. But the foreign wives made even him sin!