He shall suck the poison of asps - That which he swallowed as pleasant nutriment, shall become the most deadly poison; or the consequence shall be as if he had sucked the poison of asps. It would seem that the ancients regarded the poison of the serpent as deadly, however, it was taken into the system. They seem not to have been aware that the poison of a wound may be sucked out without injury to him who does it; and that it is necessary that the poison should mingle with the blood to be fatal.
The viper's tongue shall slay him - The early impression probably was, that the injury done by a serpent was by the fiery, forked, and brandished tongue, which was supposed to be sharp and penetrating. It is now known, that the injury is done by the poison ejected through a groove, or orifice in one of the teeth, which is so made as to lie flat on the roof of the mouth, except when the serpent bites, when that tooth is elevated, and penetrates the flesh. The word "viper" here (אפעה 'eph‛eh), "viper," is probably the same species of serpent that is known among the Arabs by the same name still - El Effah. See the notes at Isaiah 30:6. It is the most common and venomous of the serpent tribe in Northern Africa and in South-western Asia. It is remarkable for its quick and penetrating poison. It is about two feet long, as thick as a man's arm, beautifully spotted with yellow and brown, and sprinkled over with blackish specks. They have a large mouth, by which they inhale a large quantity of air, and when inflated therewith, they eject it with such force as to be heard a considerable distance. "Jackson." Capt. Riley, in his "Authentic Narrative," (New York, 1817,) confirms this account. He describes the viper as the "most beautiful object in nature," and says that the poison is so virulent as to cause death in fifteen minutes.

He shall suck the poison of asps - That delicious morsel, that secret, easily-besetting sin, so palatable, and so pleasurable, shall act on the life of his soul, as the poison of asps would do on the life of his body. The poison is called the gall of asps, it being anciently supposed that the poison of serpents consists in their gall, which is thought to be copiously exuded when those animals are enraged; as it has been often seen that their bite is not poisonous when they are not angry. Pliny, in speaking of the various parts of animals, Hist. Nat. lib. xi., c. 37, states, from this circumstance, that in the gall, the poison of serpents consists; ne quis miretur id (fel) venenum esse serpentum. And in lib. xxviii., c. 9, he ranks the gall of horses among the poisons: Damnatur (fel) equinum tantum inter venena. We see, therefore, that the gall was considered to be the source whence the poison of serpents was generated, not only in Arabia, but also in Italy.

He shall suck the (g) poison of asps: the viper's tongue shall slay him.
(g) He compares ill-gotten goods to the venom of asps, which is a dangerous serpent, noting that Jobs great riches were not truly come by and therefore God plagues him justly for the same.

He shall suck the poison of asps,.... Or "the head of asps" (u); for their poison lies in their heads, particularly in their "teeth" (w); or rather is a liquor in the gums, yellow like oil (x); according to Pliny (y), in copulation the male puts his head into the mouth of the female, which she sucks and gnaws off through the sweetness of the pleasure, then conceives her young, which eat out her belly; this is to be understood not of the man's sin, then it would have been expressed either in the past or present tense, as if that was sweet unto him in the commission of it, sucked in like milk from the breast, or honey from the honeycomb; such were his contrivances and artful methods, and the success of them in getting riches, but in the issue proved like the poison of asps, pernicious and deadly to him, which caused him to vomit them up again; for poison excites vomiting: but of the punishment of his sin; for putting men to death by the poison of asps was a punishment inflicted by some people upon malefactors; and however, it is certain death, and immediately and quickly dispatches, and without sense; so the wages of sin is death, and there is no avoiding it, and it comes insensibly on carnal men; they are not aware of it, and in no pain about it, until in hell they lift up their eyes as the rich man did:
the viper's tongue shall slay him; though it is with its teeth it bites, yet, when it is about to bite, it puts out its tongue, and to it its poison is sometimes ascribed; though it is said (z) to be quite harmless, and therefore not to be understood in a literal sense, but figuratively of the tongue of a detractor, a calumniator and false accuser, such an one as Doeg; but cannot be the sense here, since the fall of the person here described would not be by any such means; but the phrase, as before, denotes the certain and immediate death of such a wicked man; for the bite of a viper was always reckoned incurable, and issued in sudden death, see Acts 28:3.
(u) "caput aspidum", V. L. Montanus. (w) Plin. Nat. Hist. l. 11. c. 37. Aelian. Hist. Animal. l. 9. c. 4. (x) Philosoph. Transact. ut supra. (abridged, vol. 2. p. 819.) (y) Ib. c. 62. (z) Scheuchzer, ut supra, (Physic. Sacr. vol. 4.) p. 712.

shall suck--It shall turn out that he has sucked the poison, &c.