Exodus 34:16
and when you take some of their daughters as brides for your sons, their daughters will prostitute themselves to their gods and cause your sons to do the same.

Deuteronomy 7:3
Do not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,

Nehemiah 13:23
In those days I also saw Jews who had married women from Ashdod, Ammon, and Moab.

Nehemiah 13:25
I rebuked them and called down curses on them. I beat some of these men and pulled out their hair. Then I made them take an oath before God and said: "You must not give your daughters in marriage to their sons or take their daughters as wives for your sons or for yourselves!

Nehemiah 13:30
Thus I purified the priests and Levites from everything foreign, and I assigned specific duties to each of the priests and Levites.