Acts 7:51

You stiff-necked, and uncircumcised in heart and in ears, you do always resist the Holy Spirit; as your fathers did, so also do you.

Romans 5:20-21

But, besides the first offense, law was introduced, in order that offenses might abound: but where sin abounded, grace did much more abound:

Treasury of Scripture Knowledge

Summary

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.

A stiff-necked

Bible References

A stiff-necked

Acts 7:51
You stiff-necked, and uncircumcised in heart and in ears, you do always resist the Holy Spirit; as your fathers did, so also do you.
Romans 5:20
But, besides the first offense, law was introduced, in order that offenses might abound: but where sin abounded, grace did much more abound: