Deuteronomy 10:16

So you shall circumcise the foreskin of your heart, and {do not be stubborn}.

Jeremiah 4:4

Circumcise yourselves to Yahweh, and remove the foreskins of your hearts, men of Judah and inhabitants of Jerusalem, lest my wrath goes forth like the fire and burns, and there is no [one who] extinguishes [it], because of the evil of your deeds."

Deuteronomy 9:6

"So you should understand that [it is] not because of your righteousness [that] Yahweh your God [is] giving you this good land to take possession of it, because {you are a stubborn people}.

Deuteronomy 30:6

"And Yahweh your God will circumcise your heart and the heart of your offspring to love Yahweh your God with all your heart and with all your inner self {so that you may live}.

Leviticus 26:41

I myself also went against them in hostility, and I brought them into the land of their enemies--or [if] then their uncircumcised heart is humbled and then they pay for their guilt,

Romans 2:28-29

For the Jew is not {one outwardly}, nor [is] circumcision {outwardly}, in the flesh.

Colossians 2:11

in whom also you were circumcised with a circumcision not made by hands, by the removal of the body of the flesh, by the circumcision of Christ,

Deuteronomy 9:13

And Yahweh spoke to me, {saying}, 'I have seen this people, and look! {They are a stubborn people}.

Deuteronomy 31:27

For I know your rebellion and your stiff neck [even now] while I [am] still alive with you {today}, rebelling against Yahweh, and {how much more} after my death.

Jeremiah 4:14

Cleanse your heart from wickedness, Jerusalem, so that you may be saved. {How long} will your thoughts of mischief dwell in your inner part?

James 4:6-7

But he gives greater grace. Therefore it says, "God opposes the proud, but gives grace to 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
"So you should understand that [it is] not because of your righteousness [that] Yahweh your God [is] giving you this good land to take possession of it, because {you are a stubborn people}.
Deuteronomy 31:27
For I know your rebellion and your stiff neck [even now] while I [am] still alive with you {today}, rebelling against Yahweh, and {how much more} after my death.
James 4:6
But he gives greater grace. Therefore it says, "God opposes the proud, but gives grace to the humble."