Circumcise

Deuteronomy 30:6
The LORD your God will circumcise your hearts and the hearts of your descendants, and you will love Him with all your heart and all your soul, so that you may live.

Leviticus 26:41
and I acted with hostility toward them and brought them into the land of their enemies--and if their uncircumcised hearts will be humbled and they will make amends for their iniquity,

Jeremiah 4:4, 14
Circumcise yourselves to the LORD, remove the foreskins of your hearts, O men of Judah and people of Jerusalem. Otherwise, My wrath will break out like fire and burn with no one to extinguish it, because of your evil deeds." . . .

Romans 2:28, 29
A man is not a Jew because he is one outwardly, nor is circumcision only outward and physical. . . .

Colossians 2:11
In Him you were also circumcised in the putting off of your sinful nature, with the circumcision performed by Christ and not by human hands.

stiff-necked

Deuteronomy 9:6, 13
Understand, then, that it is not by your righteousness that the LORD your God is giving you this good land to possess, for you are a stiff-necked people. . . .

Deuteronomy 31:27
For I know how rebellious and stiff-necked you are. If you are already rebelling against the LORD while I am still alive, how much more will you rebel after my death!

James 4:6, 7
But He gives us more grace. This is why it says: "God opposes the proud, but gives grace to the humble." . . .