They have sharpened their tongues like a serpent,.... Which Kimchi says it does before it bites. Aristotle (i) observes, that the tip or extreme point of a serpent's tongue is as small as a hair, and so exceeding sharp and piercing. Arama interprets this of the sharpness and cunning of the serpent; and particularly the serpent that deceived Eve, and spake cunningly to her. "For God knoweth", &c. and may design the calumnies and detractions, which were sharp as a razor; as swords, and spears, and arrows, and as the tongue of a serpent, Psa 57:4; and the subtlety of false teachers, and deceitful workers; and the sharp and cutting words of wicked men against Christ and his people, Jde 1:15; adder's poison is under their lips; which may signify the malignity of sin in wicked men, which comes from the old serpent the devil; is latent in men; very infectious, like poison, and deadly and incurable, but by the grace of God, and blood of Christ: and may describe particularly the mischief of the tongue, which is a little member, as the asp is a little creature; but very mischievous, full of deadly poison, which lurks in it, lies under it, and which spitting out, it stupifies and kills insensibly; as do the calumnies of wicked men, and the doctrines of false teachers; see Rom 3:13. The Targum is, "the poison of the spider;'' though it is said (k) the spider is not venomous. Selah; on this word; see Gill on Psa 3:2. (i) Hist. Animal. l. 2. c. 17. (k) Philosoph. Transact. abridged, vol. 2. p. 800. & vol. 5. par. 1. p. 24.