Nehemiah 10:30
"We will not give our daughters in marriage to the people of the land, nor take their daughters for our sons.
Exodus 34:16
"You are not to take any of their daughters for your sons. Otherwise, when their daughters prostitute themselves with their gods, they may cause your sons to prostitute themselves with their gods.
Deuteronomy 7:3
You are not to intermarry with them. You are not to give your daughters to their sons nor take their daughters for your sons,
Ezra 9:1-3
After these things occurred, certain officials approached me and said "The people of Israel, the priests, and the descendants of Levi have not separated themselves from the people of the lands or from the detestable behavior of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians, and the Amorites,
Ezra 9:12-14
"The land you are entering to possess is a morally unclean land due to the moral uncleanness of the nations of the lands along with their abominations that has filled it from one end to the other with their impurities. So, therefore, do not give your daughters in marriage to their sons, nor marry their daughters to your sons, and under no circumstances are you to seek their well-being or their wealth, so that you may remain strong, enjoying the best things the land has to give, and so that you may establish an inheritance for your children forever.'
Ezra 10:10-12
Ezra the priest stood up and spoke to them, "You have sinned by marrying foreign wives, thereby increasing the transgressions of Israel.