Job 41:30

His undersides are jagged potsherds, spreading out the mud like a threshing sledge.

Sharp stones are under him: he spreadeth sharp pointed things upon the mire.

Note Sharp stones: Heb. Sharp pieces of potsherd

His undersides are like sharp potsherds, leaving a trail in the mud like a threshing sledge.

His underparts are like sharp potsherds: He spreadeth as it were a threshing-wain upon the mire.