Deuteronomy 10:16

Circumcise, therefore, the foreskin of your heart, and no longer be stiffnecked.

Jeremiah 4:4

Circumcise yourselves to the LORD, and take away the foreskins of your heart, ye men of Judah and inhabitants of Jerusalem lest my fury come forth like fire and burn so that no one can quench it because of the evil of your doings.

Deuteronomy 9:6

Understand, therefore, that the LORD thy God does not give thee this good land to inherit because of thy righteousness, for thou art a stiffnecked people.

Deuteronomy 30:6

And the LORD thy God will circumcise thine heart and the heart of thy seed, to love the LORD thy God with all thine heart and with all thy soul, that thou may live.

Leviticus 26:41

and that I also have walked contrary unto them and have brought them into the land of their enemies; and then their uncircumcised hearts shall be humbled, and they shall plead because of their iniquity;

Romans 2:28-29

For he is not a Jew who is one outwardly, neither is circumcision that which is done outwardly in the flesh;

Colossians 2:11

In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of the Christ;

Deuteronomy 9:13

Furthermore, the LORD spoke unto me, saying, I have seen this people, and, behold, it is a stiffnecked people.

Deuteronomy 31:27

For I know thy rebellion and thy stiff neck; behold, while I am yet alive with you today, ye are rebels against the LORD, and how much more after my death?

Jeremiah 4:14

O Jerusalem, wash thine heart from wickedness that thou may be saved. How long shalt thou entertain the thoughts of thy iniquity within thee?

James 4:6-7

But he gives greater grace. Therefore he says, God resists the proud, but gives grace unto the humble.

Treasury of Scripture Knowledge

Summary

Circumcise therefore the foreskin of your heart, and be no more stiffnecked.

Bible References

Stiff-necked

Deuteronomy 9:6
Understand, therefore, that the LORD thy God does not give thee this good land to inherit because of thy righteousness, for thou art a stiffnecked people.
Deuteronomy 31:27
For I know thy rebellion and thy stiff neck; behold, while I am yet alive with you today, ye are rebels against the LORD, and how much more after my death?
James 4:6
But he gives greater grace. Therefore he says, God resists the proud, but gives grace unto the humble.