Philippians 3:6
Circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; as to the law, a Pharisee — Paul's pedigree is impeccable. Circumcision on the eighth day (not later conversion circumcision) shows lifelong covenant membership. Benjamin (alongside Judah) survived exile, making it a marker of true Israel. 'Hebrew of Hebrews' (Hebraiōs ex Hebraious) emphasizes linguistic and cultural authenticity. Pharisee status was the highest attainment in Jewish piety: he mastered Torah and its traditions. He lists the credentials his opponents would vaunt.