1 Corinthians 7:18

AUV(i) 18 Was any man already circumcised when he was called [by God to be a Christian]? Then he should not [try to] become uncircumcised. [Note: Some Jews in that day resorted to a surgical procedure in an attempt to conceal their circumcision]. Was any man uncircumcised when he was called? Then he should not become circumcised.