Reference

Job 41:24

His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.
22

In his neck remaineth strength, and sorrow is turned into joy before him.

23

The flakes of his flesh are joined together: they are firm in themselves; they cannot be moved.

24

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

25

When he raiseth up himself, the mighty are afraid: by reason of breakings they purify themselves.

26

The sword of him that layeth at him cannot hold: the spear, the dart, nor the habergeon.