John Gill Commentary Job 41:30

"His underparts are [like] sharp potsherds: He spreadeth [as it were] a threshing-wain upon the mire." — Job 41:30 (ASV)

Sharp stones [are] under him
And yet give him no pain nor uneasiness;

he spreadeth sharp pointed things upon the mire ;
and makes his bed of them and lies upon them; as sharp stones, as before, shells of fishes, broken pieces of darts, arrows, and javelins thrown at him, which fall around him: this does not so well agree with the crocodile, the skin of whose belly is soft and thin; wherefore dolphins plunge under it and cut it with a thorn, as Pliny ^F8 relates, or with spiny fins ^F9 ; but with the whale, which lies among hard rocks and sharp stones, and large cutting pieces of ice, as in the northern seas.

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FOOTNOTES:

• F8: Nat. Hist. l. 8. c. 25.
• F9: Sandys's Travels, l. 2. p. 78.