1 Corinthians 7:12-14

Young's Literal Translation

¹² And to the rest I speak -- not the Lord -- if any brother hath a wife unbelieving, and she is pleased to dwell with him, let him not send her away;

¹³ and a woman who hath a husband unbelieving, and he is pleased to dwell with her, let her not send him away;

¹⁴ for the unbelieving husband hath been sanctified in the wife, and the unbelieving wife hath been sanctified in the husband; otherwise your children are unclean, but now they are holy.