Ezra 9:2

“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.

“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,

‘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.’

shall we again break Your commandments and intermarry with the peoples who commit these abominations? Would You not be angry with us to the point of destruction, until there is no remnant nor any who escape?

And Shecaniah the son of Jehiel, one of the sons of Elam, answered and 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.

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

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

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

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.