Yet they hearkened not unto me, nor inclined their ear, but hardened their neck: they did worse than their fathers.
Hardened their neck - (Deuteronomy 31:27 "I know ... thy stiff neck;" Isaiah 48:4, "Thy neck is an iron sinew, and thy brow brass;" Acts 7:51).
Worse than their fathers - (Jeremiah 16:12). In Jeremiah 7:22. He had said, "your fathers;" here He says, "their fathers;" the change to the third person marks growing alienation from them. He no longer addresses themselves, as it would be a waste of words in the case of such hardened rebels.