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.”

Exodus 22:31

You shall be holy men to Me, therefore you shall not eat any flesh torn to pieces in the field; you shall throw it to the dogs.

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.

Ezra 10:18-44

Among the sons of the priests who had married foreign wives were found of the sons of Jeshua the son of Jozadak, and his brothers: Maaseiah, Eliezer, Jarib and Gedaliah.

Nehemiah 13:23-24

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

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?

Deuteronomy 7:6

For you are a holy people to the Lord your God; the Lord your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth.

Deuteronomy 14:2

For you are a holy people to the Lord your God, and the Lord has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth.

Ezra 10:2

Shecaniah the son of Jehiel, one of the sons of Elam, said to Ezra, “We have been unfaithful to our God and have married foreign women from the peoples of the land; yet now there is hope for Israel in spite of this.

Genesis 6:2

that the sons of God saw that the daughters of men were beautiful; and they took wives for themselves, whomever they chose.

Exodus 19:6

and you shall be to Me a kingdom of priests and a holy nation.’ These are the words that you shall speak to the sons of Israel.”

Deuteronomy 7:1-4

When the Lord your God brings you into the land where you are entering to possess it, and clears away many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations greater and stronger than you,

Nehemiah 13:3-4

So when they heard the law, they excluded all foreigners from Israel.

Nehemiah 13:17

Then I reprimanded the nobles of Judah and said to them, “What is this evil thing you are doing, by profaning the sabbath day?

Nehemiah 13:28

Even one of the sons of Joiada, the son of Eliashib the high priest, was a son-in-law of Sanballat the Horonite, so I drove him away from me.

Isaiah 6:13

“Yet there will be a tenth portion in it,
And it will again be subject to burning,
Like a terebinth or an oak
Whose stump remains when it is felled.
The holy seed is its stump.”

Malachi 2:11

Judah has dealt treacherously, and an abomination has been committed in Israel and in Jerusalem; for Judah has profaned the sanctuary of the Lord which He loves and has married the daughter of a foreign god.

Malachi 2:15

But not one has done so who has a remnant of the Spirit. And what did that one do while he was seeking a godly offspring? Take heed then to your spirit, and let no one deal treacherously against the wife of your youth.

1 Corinthians 7:14

For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband; for otherwise your children are unclean, but now they are holy.

Treasury of Scripture Knowledge

Summary

For they have taken of their daughters for themselves, and for their sons: so that the holy seed have mingled themselves with the people of those lands: yea, the hand of the princes and rulers hath been chief in this trespass.

Bible References

Taken of their

Ezra 10:18
Among the sons of the priests who had married foreign wives were found of the sons of Jeshua the son of Jozadak, and his brothers: Maaseiah, Eliezer, Jarib and Gedaliah.
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 7:1
When the Lord your God brings you into the land where you are entering to possess it, and clears away many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations greater and stronger than you,
Nehemiah 13:23
In those days I also saw that the Jews had married women from Ashdod, Ammon and Moab.
Malachi 2:11
Judah has dealt treacherously, and an abomination has been committed in Israel and in Jerusalem; for Judah has profaned the sanctuary of the Lord which He loves and has married the daughter of a foreign god.

The holy seed

Exodus 19:6
and you shall be to Me a kingdom of priests and a holy nation.’ These are the words that you shall speak to the sons of Israel.”
Exodus 22:31
You shall be holy men to Me, therefore you shall not eat any flesh torn to pieces in the field; you shall throw it to the dogs.
Deuteronomy 7:6
For you are a holy people to the Lord your God; the Lord your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth.
Deuteronomy 14:2
For you are a holy people to the Lord your God, and the Lord has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth.
Isaiah 6:13
“Yet there will be a tenth portion in it,
And it will again be subject to burning,
Like a terebinth or an oak
Whose stump remains when it is felled.
The holy seed is its stump.”
Malachi 2:15
But not one has done so who has a remnant of the Spirit. And what did that one do while he was seeking a godly offspring? Take heed then to your spirit, and let no one deal treacherously against the wife of your youth.
1 Corinthians 7:14
For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband; for otherwise your children are unclean, but now they are holy.

Mingled

Genesis 6:2
that the sons of God saw that the daughters of men were beautiful; and they took wives for themselves, whomever they chose.
Nehemiah 13:3
So when they heard the law, they excluded all foreigners from 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?

The hand

Ezra 10:18
Among the sons of the priests who had married foreign wives were found of the sons of Jeshua the son of Jozadak, and his brothers: Maaseiah, Eliezer, Jarib and Gedaliah.
Nehemiah 13:4
Now prior to this, Eliashib the priest, who was appointed over the chambers of the house of our God, being related to Tobiah,

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.
Nehemiah 10:30
and that we will not give our daughters to the peoples of the land or take their daughters for our sons.