Job 41:30 KJV
Sharp stones are under him: he spreadeth sharp pointed things upon the mire.
Job 41:30, King James Version
In context
29 Darts are counted as stubble: he laugheth at the shaking of a spear.
30 Sharp stones are under him: he spreadeth sharp pointed things upon the mire.
31 He maketh the deep to boil like a pot: he maketh the sea like a pot of ointment.