Musar su Salmi 55:12

And this is the thing about the group of liars - the content of this group is divided into nine sections:
The first section: The lying man that left the Torah and does evil and destroys with the response of his mouth - like one who contradicts his countryman about a deposit or a transfer or the wage of a wage-worker, as it is stated (Leviticus 19:11), “you shall not deal deceitfully or falsely, a man towards his countryman.” And likewise, one who bears false witness against his neighbor; and it is said (Exodus 20:13), “you shall not bear false witness against your neighbor.” And included in this section is deception and fraud in commerce and in partnerships; and it is stated (Leviticus 25:14), “you shall not cheat, one man, his brother.” And it is [also] stated (Psalms 55:12), “fraud and deceit never leave its square.” And he is called a man of iniquity and a ruffian; and he is the heaviest with iniquity from the groups of the evildoers, as we have discussed in the Gates of Fear of Sin (no longer extant). And the characteristics of this man of iniquity are that he winks his eyes and rolls his fingers, as it is written (Proverbs 6:12-13), “A ruffian individual, a man of iniquity, etc. Winking his eyes, etc.”