Job 41:24

His heart is as firm as a stone; yea, as hard as a piece of the ^*nether millstone.

His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.

NKJV: His heart is as hard as stone, Even as hard as the lower millstone.

ESV: His heart is hard as a stone, hard as the lower millstone.

Relight