Job 20:16

“He shall suck the poison of asps, etc.] Or “the head of asps” f785; for their poison lies in their heads, particularly in their “teeth” f786; or rather is a liquor in the gums, yellow like oil f787; according to Pliny f788, 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…”

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

“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…”

“the poison: Rom 3:13 the viper's: Isa 30:6; Mat 3:7; Act 28:3-6 Job 20:17”