Romans 2:28-29

Young's Literal Translation

²⁸ For he is not a Jew who is [so] outwardly, neither [is] circumcision that which is outward in flesh;

²⁹ but a Jew [is] he who is [so] inwardly, and circumcision [is] of the heart, in spirit, not in letter, of which the praise is not of men, but of God.