Nehemiah 13:23

In those days I also saw that the Jews had married women from Ashdod, Ammon and Moab.

Nehemiah 10:30

and that we will not give our daughters to the peoples of the land or take their daughters for our sons.

Ezra 9:1-2

Now when these things had been completed, the princes approached me, saying, “The people of Israel and the priests and the Levites have not separated themselves from the peoples of the lands, according to their abominations, those of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians and the Amorites.

Ezra 10:10

Then Ezra the priest stood up and said to them, “You have been unfaithful and have married foreign wives adding to the guilt of Israel.

Nehemiah 13:1

On that day they read aloud from the book of Moses in the hearing of the people; and there was found written in it that no Ammonite or Moabite should ever enter the assembly of God,

1 Samuel 5:1

Now the Philistines took the ark of God and brought it from Ebenezer to Ashdod.

Ezra 9:11-12

which You have commanded by Your servants the prophets, saying, ‘The land which you are entering to possess is an unclean land with the uncleanness of the peoples of the lands, with their abominations which have filled it from end to end and with their impurity.

Ezra 10:44

All these had married foreign wives, and some of them had wives by whom they had children.

Nehemiah 4:7

Now when Sanballat, Tobiah, the Arabs, the Ammonites and the Ashdodites heard that the repair of the walls of Jerusalem went on, and that the breaches began to be closed, they were very angry.

2 Corinthians 6:14

Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness?

Treasury of Scripture Knowledge

Summary

In those days also saw I Jews that had married wives of Ashdod, of Ammon, and of Moab:

Bible References

Married

Nehemiah 10:30
and that we will not give our daughters to the peoples of the land or take their daughters for our sons.
Ezra 9:2
For they have taken some of their daughters as wives for themselves and for their sons, so that the holy race has intermingled with the peoples of the lands; indeed, the hands of the princes and the rulers have been foremost in this unfaithfulness.”
Ezra 10:10
Then Ezra the priest stood up and said to them, “You have been unfaithful and have married foreign wives adding to the guilt of Israel.
2 Corinthians 6:14
Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness?

Ammon

Nehemiah 13:1
On that day they read aloud from the book of Moses in the hearing of the people; and there was found written in it that no Ammonite or Moabite should ever enter the assembly of God,

General references

Exodus 34:16
and you might take some of his daughters for your sons, and his daughters might play the harlot with their gods and cause your sons also to play the harlot with their gods.
Deuteronomy 7:3
Furthermore, you shall not intermarry with them; you shall not give your daughters to their sons, nor shall you take their daughters for your sons.
Judges 3:6
and they took their daughters for themselves as wives, and gave their own daughters to their sons, and served their gods.