Job 41:24
Berean Standard Bible
His chest is as hard as a rock, as hard as a lower millstone!
King James Version
His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.
World English Bible
His heart is as firm as a stone, yes, firm as the lower millstone.
American Standard Version
His heart is as firm as a stone; Yea, firm as the nether millstone.