Biblical Advice on a Believer Married to an Unbeliever

¹²But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away. ¹³And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him. ¹⁴For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy. ¹⁵But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace. ¹⁶For what knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?