Job 41:24
His heart is hard as a stone, hard as the lower millstone.
Isaiah 48:4
Because I know that you are obstinate, and your neck is an iron sinew and your forehead brass,
Jeremiah 5:3
O LORD, do not your eyes look for truth? You have struck them down, but they felt no anguish; you have consumed them, but they refused to take correction. They have made their faces harder than rock; they have refused to repent.
Zechariah 7:12
They made their hearts diamond-hard lest they should hear the law and the words that the LORD of hosts had sent by his Spirit through the former prophets. Therefore great anger came from the LORD of hosts.
Treasury of Scripture Knowledge
Summary
His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.
As hard
Bible References
As hard
Isaiah 48:4
Because I know that you are obstinate, and your neck is an iron sinew and your forehead brass,
Jeremiah 5:3
O LORD, do not your eyes look for truth? You have struck them down, but they felt no anguish; you have consumed them, but they refused to take correction. They have made their faces harder than rock; they have refused to repent.
Zechariah 7:12
They made their hearts diamond-hard lest they should hear the law and the words that the LORD of hosts had sent by his Spirit through the former prophets. Therefore great anger came from the LORD of hosts.