GEN1236 [A category of liars is] one who comes with cunning and words of guile to withhold good from its owner and direct it towards himself.   He does not steal from his fellowman that which is already his, nor rob it by force.  Rather, he sets his eyes on the good destined for the other, and he stalks it, taking possession of it through his false words. Alternatively, through his lies he maneuvers the other into giving it to him as a gift.   He is punished primarily for lying; nonetheless, the punishment for lying takes on greater severity when another’s loss is involved (even though [here] the punishment is not primarily for the loss incurred, since he did not deprive the other person of something that he already acquired).   This is as our Sages said Sanhedrin 92a [I.e. describing the severity of sinning through verbal manipulation], “One who speaks words of guild is as if he has served idols, as the pasuk says [this verse]. GATES 363-5  [See also TZADIK 385]