They have sharpened their tongues; their malicious hearts stirred up their tongues to utter vile slanders against me. Like a serpent; either whetting their tongues, as serpents are said to whet theirs when they are about to bite; or rather, using words as sharp and piercing as the sting of a serpent.
Related Commentaries of Psalms 140:3
Psalms 140:3
3 They have sharpened their tongues like a serpent; adders' poison is under their lips. Selah.