His bones are as strong pieces of brass - The circumstance here adverted to was remarkable, because the common residence of the animal was the water, and the bones of aquatic animals are generally hollow, and much less firm than those of land animals. It should be observed here, that the word rendered "brass" in the Scriptures most probably denotes "copper." Brass is a compound metal, composed of copper and zinc; and there is no reason to suppose that the art of compounding it was known at as early a period of the world as the time of Job. The word here translated "strong pieces" (אפיק 'âphı̂yq) is rendered by Schultens "alvei - channels," or "beds," as of a rivulet or stream; and by Rosenmuller, Gesenius, Noyes, and Umbreit, "tubes" - supposed to allude to the fact that they seemed to be hollow tubes of brass. But the more common meaning of the word is "strong, mighty," and there is no impropriety in retaining that sense here; and then the meaning would be, that his bones were so firm that they seemed to be made of solid metal.

His bones are as strong pieces of brass-bars of iron - The tusk I have mentioned above is uncommonly hard, solid, and weighty for its size.

His bones are as strong pieces of brass: his bones are as bars of iron. Than which nothing is stronger. The repetition is made for greater illustration and confirmation; but what is said is not applicable to the elephant, whose bones are porous and rimous, light and spongy for the most part, as appears from the osteology (k) of it; excepting its teeth, which are the ivory; though the teeth of the river horse are said to exceed them in hardness (l); and artificers say (m) they are wrought with greater difficulty than ivory. The ancients, according to Pausanias (n), used them instead of it; who relates, that the face of the image of the goddess Cybele was made of them: and Kircher (o) says, in India they make beads, crucifixes, and statues of saints of them; and that they are as hard or harder than a flint, and fire may be struck out of them. So the teeth of the morss, a creature of the like kind in the northern countries, are valued by the inhabitants as ivory (p), for hardness, whiteness, and weight, beyond it, and are dearer and much traded in; See Gill on Job 40:20; but no doubt not the teeth only, but the other bones of the creature in the text are meant.
(k) In Philosoph. Transact. vol. 5. p. 155, 156. (l) Odoardus Barbosa apud Bochart. ut supra. (Apud Hierozoic. par. 2. l. 5. c. 14. col. 758.) (m) Diepenses apud ib. (n) Arcadica, sive, l. 8. p. 530. (o) China cum Monument. p. 193. (p) Olaus Magnus, ut supra, (De Ritu. Septent. Gent.) l. 2. c. 19. Voyage to Spitzbergen, p. 115.

strong--rather, "tubes" of copper [UMBREIT].