Ezra 9:1, 2, 11, 12

After these things had been done, the leaders came to me and said, “The people of Israel, including the priests and the Levites, have not kept themselves separate from the neighboring peoples with their detestable practices, like those of the Canaanites, Hittites, Perizzites, Jebusites, Ammonites, Moabites, Egyptians and Amorites.

They have taken some of their daughters as wives for themselves and their sons, and have mingled the holy race with the peoples around them. And the leaders and officials have led the way in this unfaithfulness.”

you gave through your servants the prophets when you said: ‘The land you are entering to possess is a land polluted by the corruption of its peoples. By their detestable practices they have filled it with their impurity from one end to the other.

Therefore, do not give your daughters in marriage to their sons or take their daughters for your sons. Do not seek a treaty of friendship with them at any time, that you may be strong and eat the good things of the land and leave it to your children as an everlasting inheritance.’