Deuteronomy 23:3

The Ammonites and the Moabites shall not come into the congregation of the LORD; no, not in the tenth generation, no they shall never come in to the congregation of the LORD,

Nehemiah 13:1-2

And what time as the book of Moses was read in the ears of the people there was found written therein, that the Ammonites and Moabites should never come into the congregation of God,

Ruth 4:6

Then said the kinsman, "I cannot purchase it for marrying of mine own inheritance: take thou my right to thee, for I cannot purchase it."

Ruth 4:10-22

And moreover, Ruth the Moabite, the wife of Mahlon, do I take unto me to wife to stir up the name of the dead upon his inheritance, that his name be not put out from among his brethren, and from the gate of his city: ye are witnesses this day."

Nehemiah 4:3

And Tobiah the Ammonite beside him said, "Let them build on: if a fox go up, he shall break down their stony wall."

Nehemiah 4:7

But when Sanballat, and Tobiah, and the Arabians, and Ammonites, and Ashdodites heard that the walls of Jerusalem were made up, and that they had begun to stop up the gaps, they were very wroth;

Nehemiah 13:23

And at the same time saw I Jews, that married wives of Ashdod, Ammon, and of Moab;

Isaiah 56:3

Then shall not the stranger, which cleaveth to the LORD, say, "Alas the LORD hath shut me clean out from his people." Neither shall the gelded man say, "Lo, I am a dried tree."

Treasury of Scripture Knowledge

Summary

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:

Bible References

Ammonite

Nehemiah 4:3
And Tobiah the Ammonite beside him said, "Let them build on: if a fox go up, he shall break down their stony wall."
Nehemiah 13:1
And what time as the book of Moses was read in the ears of the people there was found written therein, that the Ammonites and Moabites should never come into the congregation of God,
Isaiah 56:3
Then shall not the stranger, which cleaveth to the LORD, say, "Alas the LORD hath shut me clean out from his people." Neither shall the gelded man say, "Lo, I am a dried tree."