Nehemiah 10:30
And we swore that we would not give our daughters to the people of the land nor take their daughters for our sons.
Exodus 34:16
and lest you take from their daughters for your sons, and their daughters go whoring after their gods and make your sons go whoring after their gods.
Deuteronomy 7:3
Nor shall you make marriages with them. You shall not give your daughter to his son, nor shall you take his daughter to your son.
Ezra 9:1-3
And at the end of these things, the rulers came to me, saying, The people of Israel, and the priests and the Levites, have not separated themselves from the people of the lands. But they are doing according to their abominations, those of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians, and the Amorites.
Ezra 9:12-14
And now do not give your daughters to their sons, nor take their daughters to your sons, nor seek their peace or their wealth forever, so that you may be strong and eat the good of the land and leave it for an inheritance to your sons forever.
Ezra 10:10-12
And Ezra the priest stood up and said to them, You have sinned, and have taken strange women to increase the sin of Israel.