Ezra 9:2; Malachi 2:15

hFor they have taken some of their daughters to be wives for themselves and for their sons, so that the iholy race1 has jmixed itself with the peoples of the lands. And in this faithlessness the hand of the officials and chief men has been foremost.

15 aDid he not make them one, with a portion of the Spirit in their union?1 And what was the one God2 seeking?3 bGodly offspring. So guard yourselves4 in your spirit, and let none of you be tfaithless to the wife of your youth.