Circumcise your hearts, therefore, and stiffen your necks no more.

Genesis 17:11
You are to circumcise the flesh of your foreskin, and this will be a sign of the covenant between Me and you.

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,

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

Deuteronomy 9:13
The LORD also said to me, "I have seen this people, and they are indeed a stiff-necked people.

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 with all your soul, so that you may live.

Jeremiah 4:4
Circumcise yourselves to the LORD, and 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."

Ezekiel 44:7
In addition to all your other abominations, you brought in foreigners uncircumcised in both heart and flesh to occupy My sanctuary; you defiled My temple when you offered My food--the fat and the blood; you broke My covenant.

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