Nehemiah 5:8

5:8 I said to them, “To the extent possible we have bought back our fellow Jews who had been sold to the Gentiles. But now you yourselves want to sell your own countrymen, so that we can then buy them back!” They were utterly silent, and could find nothing to say.

Nehemiah 13:25

13:25 So I entered a complaint with them. I called down a curse on them, and I struck some of the men and pulled out their hair. I had them swear by God saying, “You will not marry off your daughters to their sons, and you will not take any of their daughters as wives for your sons or for yourselves!