Deuteronomy 7:3

and I will make you swear by Yahweh, the God of heaven and the God of earth, that you shall not take a wife for my son from the daughters of the Canaanites, among whom I live,

“They shall not live in your land, lest they make you sin against Me; for if you serve their gods, it will surely be a snare to you.”

and you take some of his daughters for your sons, and his daughters play the harlot with their gods and cause your sons also to play the harlot with their gods.

“Only in the cities of these peoples that Yahweh your God is giving you as an inheritance, you shall not leave alive anything that breathes.

“For if you ever turn back and cling to the rest of these nations, these which remain among you, and intermarry with them, so that you go along with them and they with you,

and as for you, you shall cut no covenant with the inhabitants of this land; you shall tear down their altars.’ But you have not listened to My voice; what is this you have done?

and they took their daughters for themselves as wives and gave their own daughters to their sons and served their gods.

But his father and his mother said to him, “Is there no woman among the daughters of your relatives, or among all our people, that you go to take a wife from the uncircumcised Philistines?” But Samson said to his father, “Take her for me, for she is right in my eyes.”

from the nations concerning which Yahweh had said to the sons of Israel, “You shall not go along with them, nor shall they go along with you, for they will surely turn your heart away after their gods.” Solomon clung to these in love.

Now it happened, as though it had been a trivial thing for him to walk in the sins of Jeroboam the son of Nebat, that he took Jezebel the daughter of Ethbaal king of the Sidonians as a wife, and went and served Baal and worshiped him.

“For they have taken some of their daughters as wives for themselves and for their sons, so that the holy seed has intermingled with the peoples of the lands; indeed, the hands of the princes and the officials have been foremost in this unfaithfulness.”

‘So now do not give your daughters to their sons nor take their daughters to your sons, and never seek their peace or their prosperity, that you may be strong and eat the good things of the land and leave it as a possession to your sons forever.’

“So now let us cut a covenant with our God to put away all the wives and their children, according to the counsel of my lord and of those who tremble at the commandment of our God; and let it be done according to the law.

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

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