ISB ~ 1 Corinthians 7 v19

neither circumcision . . . nor uncircumcision:The sign of circumcision no longer serves as an identity marker for God’s people in the New Covenant as it did under the Old (Gal 5:6; 6:15). Along with the entire body of ritual and sacrificial legislation established through Moses, the rite of circumcision came to fulfillment in the messianic age, when God began to circumcise the hearts of the faithful through Baptism (Deut 30:6; Col 2:11-12). Unlike these ceremonial laws, which are now obsolete, the moral commandments given through Moses continue to guide the children of God to spiritual maturity (CCC 1968, 1972).