Deuteronomy 10:16

Let your circumcision be of the heart, and put away your pride.

Jeremiah 4:4

Undergo a circumcision of the heart, you men of Judah and people of Jerusalem: or my wrath may come out like fire, burning so that no one is able to put it out, because of the evil of your doings.

Deuteronomy 9:6

Be certain then that the Lord your God is not giving you this good land as a reward for your righteousness; for you are a stiff-necked people.

Deuteronomy 30:6

And the Lord your God will give to you and to your seed a circumcision of the heart, so that, loving him with all your heart and all your soul, you may have life.

Leviticus 26:41

So that I went against them and sent them away into the land of their haters: if then the pride of their hearts is broken and they take the punishment of their sins,

Romans 2:28-29

The true Jew is not one who is only so publicly, and circumcision is not that which may be seen in the flesh:

Colossians 2:11

In whom you had a circumcision not made with hands, in the putting off of the body of the flesh, in the circumcision of Christ;

Deuteronomy 9:13

And then the Lord said to me, I have seen that this people is stiff-necked:

Deuteronomy 31:27

For I have knowledge of your hard and uncontrolled hearts: even now, while I am still living, you will not be ruled by the Lord; how much less after my death?

Jeremiah 4:14

O Jerusalem, make your heart clean from evil, so that you may have salvation. How long are evil purposes to have a resting-place in you?

James 4:6-7

But he gives more grace. So that the Writings say, God is against the men of pride, but he gives grace to those who make themselves low before him.

Treasury of Scripture Knowledge

Summary

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

Bible References

Stiff-necked

Deuteronomy 9:6
Be certain then that the Lord your God is not giving you this good land as a reward for your righteousness; for you are a stiff-necked people.
Deuteronomy 31:27
For I have knowledge of your hard and uncontrolled hearts: even now, while I am still living, you will not be ruled by the Lord; how much less after my death?
James 4:6
But he gives more grace. So that the Writings say, God is against the men of pride, but he gives grace to those who make themselves low before him.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain