Nehemiah 10:30
And that we would not give our daughters to the people of the land, nor take their daughters for our sons:
Exodus 34:16
And thou take of their daughters to thy sons, and their daughters go astray after their gods, and make thy sons go astray after their gods.
Deuteronomy 7:3
Neither shalt thou make marriages with them; thy daughter thou shalt not give to his son, nor his daughter shalt thou take to thy son.
Ezra 9:1-3
Now when these things were done, the princes came to me, saying, The people of Israel, and the priests, and the Levites, have not separated themselves from the people of the lands, doing according to their abominations, even of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians, and the Amorites.
Ezra 9:12-14
Now therefore give not your daughters to their sons, neither take their daughters to your sons, nor seek their peace or their wealth for ever: that ye may be strong, and eat the good of the land, and leave it for an inheritance to your children for ever.
Ezra 10:10-12
And Ezra the priest stood up, and said to them, Ye have transgressed, and have taken foreign wives to increase the trespass of Israel.