Job 41:24
Its heart is cast as stone; yes, it is cast as [the] lower millstone.
Isaiah 48:4
because {I know} that you [are] obstinate, and your neck an iron sinew, and your forehead bronze.
Jeremiah 5:3
Yahweh, do not your eyes [look] for honesty? You have struck them, but they felt no pain, you have destroyed them, they refused to take discipline. They have hardened their faces more than rock, they have refused to turn back.
Zechariah 7:12
{They made their hearts adamant} in order not to hear the law and the words that Yahweh of hosts had sent by his spirit through the former prophets; [therefore] great wrath came from Yahweh of hosts.