'Stiff necked' in the Bible

Know therefore, that the LORD your God doesn't give you this good land to possess it for your righteousness; for you are a stiff-necked people.

Furthermore the LORD spoke to me, saying, "I have seen this people, and behold, it is a stiff-necked people:

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