1 Corinthians 7:20 - Ellicott's Commentary On The Whole Bible

Let every man abide in the same calling wherein he was called. — This is an emphatic repetition of the principle on which the previous practical instruction is based. “Calling” must not here be regarded in the modern sense of profession or condition in life; it is nowhere so used in the New Testament, but always signifies God’s calling of us. (See Romans 11:29; Ephesians 1:18.) Continue to be Christians of the kind which God’s call to Christianity made you. If you were circumcised — and so God’s call into the Christian Church made you a circumcised Christian — continue so; don’t do anything which would seem to imply that some other change in addition to your “call” was necessary to complete your admission to the Church.