'Hard hearted' in the Bible

Now do not be hard-hearted, as your fathers were; but give yourselves to the Lord, and come into his holy place, which he has made his for ever, and be the servants of the Lord your God, so that the heat of his wrath may be turned away from you.

And thereto he rebelled against Nebuchadnezzar which had received an oath of him by God, and was too stiff necked and too hard hearted to turn unto the LORD God of Israel.