Deuteronomy 30:6

¹⁶Circumcise therefore the foreskin of your heart, and be no more stiff-necked.

²⁶I will also give you a new heart, and I will put a new spirit within you. I will take away the stony heart out of your flesh, and I will give you a heart of flesh. ²⁷I will put my Spirit within you, and cause you to walk in my statutes. You will keep my ordinances and do them.

³⁹I will give them one heart and one way, that they may fear me forever, for their good and the good of their children after them.

¹⁹I will give them one heart, and I will put a new spirit within them. I will take the stony heart out of their flesh, and will give them a heart of flesh, ²⁰that they may walk in my statutes, and keep my ordinances, and do them. They will be my people, and I will be their God.

²⁸For he is not a Jew who is one outwardly, neither is that circumcision which is outward in the flesh; ²⁹but 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.

¹¹In him you were also circumcised with a circumcision not made with hands, in the putting off of the body of the sins of the flesh, in the circumcision of Christ,

⁴Circumcise yourselves to the LORD, and take away the foreskins of your heart, you men of Judah and inhabitants of Jerusalem; lest my wrath go out like fire, and burn so that no one can quench it, because of the evil of your doings.

³For this is loving God, that we keep his commandments. His commandments are not grievous. ⁴For whatever is born of God overcomes the world. This is the victory that has overcome the world: your faith.

⁵You shall love the LORD your God with all your heart, with all your soul, and with all your might.

³⁷Jesus said to him, “‘You shall love the Lord your God with all your heart, with all your soul, and with all your mind.’