Nehemiah 13:3

13:3 Now it came to pass, when they had heard the law, that they separated from Israel all the mixed multitude.

Nehemiah 13:30

13:30 Thus cleansed I them from all strangers, and appointed the wards of the priests and the Levites, every one in his business;

Ezra 9:2

9:2 For they have taken of their daughters for themselves, and for their sons: so that the holy seed have mingled themselves with the people of [those] lands: yea, the hand of the princes and rulers hath been chief in this trespass.

Ezra 10:11

10:11 Now therefore make confession unto the LORD God of your fathers, and do his pleasure: and separate yourselves from the people of the land, and from the strange wives.