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Job 40:18
His bones are like tubes of bronze. His limbs are like bars of iron.

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Job 40:6
Then Yahweh answered Job out of the whirlwind:

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Job 41:24
His heart is as firm as a stone, yes, firm as the lower millstone.

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Job 41:27
He counts iron as straw, and bronze as rotten wood.

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Isaiah 48:4
Because I knew that you are obstinate, and your neck is an iron sinew, and your brow bronze;

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