1 Corinthians 7:15-20

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?

17But as God hath distributed to every man, as the Lord hath called every one, so let him walk. And so ordain I in all Assemblies. 18Is any man called being circumcised? let him not become uncircumcised. Is any called in uncircumcision? let him not be circumcised. 19Circumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God. 20Let every man abide in the same calling wherein he was called.