1 Corinthians 7:19 (KJV)

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?

But as God hath distributed to every man, as the Lord hath called every one, so let him walk. And so ordain I in all churches.

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

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.

Ye are bought with a price; be not ye the servants of men.

Brethren, let every man, wherein he is called, therein abide with God.