the heart
Exodus 9:12
And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.
Exodus 7:14
And the LORD said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.
Exodus 8:32
And Pharaoh hardened his heart at this time also, neither would he let the people go.
Job 9:4
He is wise in heart, and mighty in strength: who hath hardened himself against him, and hath prospered?
Proverbs 29:1
He, that being often reproved hardeneth his neck, shall suddenly be destroyed, and that without remedy.
Isaiah 48:4
Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass;
Daniel 5:20
But when his heart was lifted up, and his mind hardened in pride, he was deposed from his kingly throne, and they took his glory from him:
Romans 9:18
Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.