'Necks' in the Bible

And next unto them the Tekoites repaired; but their nobles put not their necks to the work of their Lord.

But they and our fathers dealt proudly, and hardened their necks, and hearkened not to thy commandments,

And refused to obey, neither were mindful of thy wonders that thou didst among them; but hardened their necks, and in their rebellion appointed a captain to return to their bondage: but thou art a God ready to pardon, gracious and merciful, slow to anger, and of great kindness, and forsookest them not.

You warned them to turn back to Your law,but they acted arrogantlyand would not obey Your commands.They sinned against Your ordinances,which a person will live by if he does them.They stubbornly resisted,stiffened their necks, and would not obey.