Deuteronomy 23:3

An Ammonite and a Moabite shall not come into the gathering of Jehovah; also the tenth generation to them shall not come in to the gathering of Jehovah, even forever:

Nehemiah 13:1-2

In that day was read in the book of Moses in the ears of the people; and it was found written in it that there shall not come in an Ammonite and a Moabite to the convocation of God, even to forever;

Ruth 4:6

And the near relative will say, I shall not be able to redeem for me, lest I shall destroy my inheritance: redeem to thyself; thou the near relative: for I shall not be able to redeem.

Ruth 4:10-22

And also Ruth the Moabitess, the wife of Mahlon, I bought to me for a wife, to raise up the name of the dead upon his inheritance; and the name of the dead shall not be cut off from his brethren and from the gate of his place: ye are witnesses this day.

Nehemiah 4:3

And Tobiah the Ammonite near him, and he will say, Also that they are building, if a fox shall go up, and he brake their walls of stones.

Nehemiah 4:7

And it will be that when Sanballat heard, and Tobiah, and the Arabians and the Ammonites, and the Ashdodites, that healing ascended to the walls of Jerusalem, that the breaches began to be stopped, and it kindled to them greatly;

Nehemiah 13:23

Also in those days I saw Jews who caused to dwell women, Ashdodites, Ammonites, Moabites:

Isaiah 56:3

And the son of the stranger joining himself to Jehovah, shall not say, saying, Jehovah separating, will separate me from his people; and the eunuch shall not say, Behold me a dry 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 near him, and he will say, Also that they are building, if a fox shall go up, and he brake their walls of stones.
Nehemiah 13:1
In that day was read in the book of Moses in the ears of the people; and it was found written in it that there shall not come in an Ammonite and a Moabite to the convocation of God, even to forever;
Isaiah 56:3
And the son of the stranger joining himself to Jehovah, shall not say, saying, Jehovah separating, will separate me from his people; and the eunuch shall not say, Behold me a dry tree.