Matthew 19:8. He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
Mark 10:5. And Jesus answered and said unto them, For the hardness of your heart he wrote you this precept.
Mark 16:14. Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
Deuteronomy 10:16. Circumcise therefore the foreskin of your heart, and be no more stiffnecked.
Sirach 16:10. He had not pity on them, destroying the whole nation that extolled themselves in their sins.
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 that none can quench it, because of the evil of your doings.