Ezra 6:21

6:21 The Israelites who were returning from the exile ate it, along with all those who had joined them in separating themselves from the uncleanness of the nations of the land to seek the Lord God of Israel.

Ezra 10:11

10:11 Now give praise to the Lord God of your fathers, and do his will. Separate yourselves from the local residents and from these foreign wives.”