en_tn/rom/03/30.md

he will justify the circumcision by faith, and the uncircumcision through faith

Here "circumcision" is a metonym that refers to Jews and "uncircumcision" is a metonym that refers to non-Jews. Alternate translation: "God will make both Jews and non-Jews right with himself through their faith in Christ" (See: rc://en/ta/man/translate/figs-metonymy)