• Deuteronomy 10:16
    Therefore circumcise the foreskin of your heart, and be stiff-necked no longer.
     
  • Deuteronomy 30:6
    And the LORD your God will circumcise your heart and the heart of your descendants, to love the LORD your God with all your heart and with all your soul, that you may live.
     
  • Romans 2:28-29
    For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; but he is a Jew who is one inwardly; and circumcision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God.
     
  • 1 Corinthians 7:19
    Circumcision is nothing and uncircumcision is nothing, but keeping the commandments of God is what matters.