Nehemiah 13:23

Also in those days I saw Jews who had married women of Ashdod, Ammon, and Moab.

Nehemiah 10:30

We will not give our daughters to the peoples of the land nor take their daughters for our sons.

Ezra 9:1-2

After finishing these things the officials approached me saying, "The people of Israel, the priests, and the Levites have not separated from the people of the lands with their detestable things, and from the Canaanites, Hittites, Perizzites, Jebusites, Ammonites, Moabites, Egyptians, and Amorites.

Ezra 10:10

Then Ezra the priest stood up and said to them, "You have broke faith and married foreign women, increasing the guilt of Israel.

Nehemiah 13:1

On that day the book of Moses was read in the hearing of the people and it was found written in it that no Ammonite or Moabite should ever come into the assembly of God

1 Samuel 5:1

Now [the] Philistines had captured the ark of God and brought it from Ebenezer to Ashdod.

Ezra 9:11-12

which you commanded by the hand of your servants the prophets saying, 'The land that you are entering to possess is a land of impurity with the impurity of the peoples of the lands, with their detestable things which they have filled from end to end with their uncleanness.

Ezra 10:44

All of these had married foreign wives, and some from among the wives bore children.

Nehemiah 4:7

Now when Sanballat, Tobiah, the Arabs, the Ammonites, and the Ashdodites heard that the restoration of the walls of Jerusalem were going forward and the gaps were being closed, they were very angry.

2 Corinthians 6:14

Do not become unevenly yoked with unbelievers, for what participation [is there between] righteousness and lawlessness? Or what fellowship [does] light [have] 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
We will not give our daughters to the peoples of the land nor take their daughters for our sons.
Ezra 9:2
For they have taken from their daughters for themselves and their sons. So the holy seed has mixed itself with the peoples of the lands, and the hand of the officials and prefects were foremost in this sin.
Ezra 10:10
Then Ezra the priest stood up and said to them, "You have broke faith and married foreign women, increasing the guilt of Israel.
2 Corinthians 6:14
Do not become unevenly yoked with unbelievers, for what participation [is there between] righteousness and lawlessness? Or what fellowship [does] light [have] with darkness?

Ammon

Nehemiah 13:1
On that day the book of Moses was read in the hearing of the people and it was found written in it that no Ammonite or Moabite should ever come into the assembly of God

General references

Exodus 34:16
and you take from their daughters for your sons, and their daughters prostitute [themselves] after their gods, and they cause your sons to prostitute [themselves] after their gods.
Deuteronomy 7:3
And you shall not intermarry with them; you shall not give your daughter to their son; and you shall not take his daughter for your son.
Judges 3:6
And they took their daughters as wives for themselves, and they gave their daughters to their sons, and they served their gods.