KJV : His heart <03820> is as firm <03332> (8803) as a stone <068>; yea, as hard <03332> (8803) as a piece <06400> of the nether <08482> [millstone].

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NASB : "His heart is as hard as a stone, Even as hard as a lower millstone.

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NASB# : "His heart<3820> is as hard<3332> as a stone<68>, Even as hard<3332> as a lower<8482> millstone<6400>.