'Stiff necked' in the Bible

Understand therefore, that the LORD thy God giveth thee not this good land to possess it for thy righteousness; for thou art a stiffnecked people.

Furthermore the LORD spake unto me, saying, I have seen this people, and, behold, it is a stiffnecked people:

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