1 Corinthians 7:17 (KJV)

But 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.

And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him.

For 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.

But 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.

For what knowest thou, O wife, whether thou shalt save thy husband? or how knowest thou, O man, whether thou shalt save thy wife?

Is any man called being circumcised? let him not become uncircumcised. Is any called in uncircumcision? let him not be circumcised.

Circumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God.

Let every man abide in the same calling wherein he was called.

Art thou called being a servant? care not for it: but if thou mayest be made free, use it rather.

For he that is called in the Lord, being a servant, is the Lord's freeman: likewise also he that is called, being free, is Christ's servant.