24 His heart is solidly set like stone, Even solidly set like the nether grindstone.
Job 41:24 Cross References - CLV
Isaiah 48:4
4 From what I know, you are obstinate, and a sinew of iron is your scruff. And your forehead is copper."
Jeremiah 5:3
3 Yahweh, Your eyes, are they not on stedfastness? You have smitten them, and they have not grieved, You have consumed them, They have refused to receive instruction, They made their faces harder than a rock, They have refused to turn back."
Zechariah 7:12
12 and their hearts they make corundum against hearing the law and the words which Yahweh of hosts sent by His spirit, by the hand of the former prophets. And great wrath is coming from Yahweh of hosts."