1 Corinthians 7:17-19

Only, as the Lord hath distributed to each man, as God hath called each, so let him walk. And so ordain I in all the churches. Was any man called being circumcised? let him not become uncircumcised. Hath any been called in uncircumcision? let him not be circumcised. Circumcision is nothing, and uncircumcision is nothing; but the keeping of the commandments of God.