Nehemiah 13:23

In those days I also saw Jews who lived with women from Ashdod, Ammon, and from Moab.

Nehemiah 10:30

And we swore that we would not give our daughters to the people of the land nor take their daughters for our sons.

Ezra 9:1-2

And at the end of these things, the rulers came to me, saying, The people of Israel, and the priests and the Levites, have not separated themselves from the people of the lands. But they are doing 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

And Ezra the priest stood up and said to them, You have sinned, and have taken strange women to increase the sin of Israel.

Nehemiah 13:1

On that day they read in the book of Moses in the ears of the people. And in it was found written that the Ammonite and the Moabite should not come into the congregation of God forever,

1 Samuel 5:1

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

Ezra 9:11-12

which You commanded by Your servants the prophets, saying, The land into which you go to possess it, is an unclean land with the filthiness of the people of the lands, with their abominations which have filled it from one end to the other with their uncleanness.

Ezra 10:44

All these had taken strange women. And many of them had women by whom they had sons.

Nehemiah 4:7

And it happened, when Sanballat and Tobiah, and the Arabians, and the Ammonites, and the Ashdodites, heard that the walls of Jerusalem had gone up, and that the breaks were being filled, they were very angry.

2 Corinthians 6:14

Do not be unequally yoked together with unbelievers; for what fellowship does righteousness have with lawlessness? And what partnership 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
And we swore that we would not give our daughters to the people of the land nor take their daughters for our sons.
Ezra 9:2
For they have taken of their daughters for themselves and for their sons. So the holy seed has mixed themselves with the people of those lands. Yes, the hand of the leaders and overseers has been chief in this sin.
Ezra 10:10
And Ezra the priest stood up and said to them, You have sinned, and have taken strange women to increase the sin of Israel.
2 Corinthians 6:14
Do not be unequally yoked together with unbelievers; for what fellowship does righteousness have with lawlessness? And what partnership does light have with darkness?

Ammon

Nehemiah 13:1
On that day they read in the book of Moses in the ears of the people. And in it was found written that the Ammonite and the Moabite should not come into the congregation of God forever,

General references

Exodus 34:16
and lest you take from their daughters for your sons, and their daughters go whoring after their gods and make your sons go whoring after their gods.
Deuteronomy 7:3
Nor shall you make marriages with them. You shall not give your daughter to his son, nor shall you take his daughter to your son.
Judges 3:6
And they took their daughters to be their wives, and gave their daughters to their sons, and served their gods.