Nehemiah 10:30
We will not give our daughters to the peoples of the land nor take their daughters for our sons.
Exodus 34:16
and you take from their daughters for your sons, and their daughters prostitute [themselves] after their gods, and they cause your sons to prostitute [themselves] after their gods.
Deuteronomy 7:3
And you shall not intermarry with them; you shall not give your daughter to their son; and you shall not take his daughter for your son.
Ezra 9:1-3
After finishing these things the officials approached me saying, "The people of Israel, the priests, and the Levites have not separated from the people of the lands with their detestable things, and from the Canaanites, Hittites, Perizzites, Jebusites, Ammonites, Moabites, Egyptians, and Amorites.
Ezra 9:12-14
Therefore, do not give your daughters to their sons, and do not take their daughters for your sons. Do not seek their peace and prosperity so that forever you may be strong and eat the good of the land and may give it as an inheritance to your sons.'
Ezra 10:10-12
Then Ezra the priest stood up and said to them, "You have broke faith and married foreign women, increasing the guilt of Israel.