1st Corinthians 7:13

10 and to the married I announce -- not I, but the Lord -- let not a wife separate from a husband:

11 but and if she may separate, let her remain unmarried, or to the husband let her be reconciled, and let not a husband send away a wife.

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.

15 And, if the unbelieving doth separate himself -- let him separate himself: the brother or the sister is not under servitude in such [cases], and in peace hath God called us;

16 for what, hast thou known, O wife, whether the husband thou shalt save? or what, hast thou known, O husband, whether the wife thou shalt save?