LEV630 If someone revealed your sin, do not say: "Just as he revealed my sin, I, too, will reveal his sin," for it is written [this verse]: "Do not take revenge and do not bear a grudge." And do not vaunt yourself, saying: "Although he revealed my sin, I will not reveal his," for in doing so you already reveal half. This is a great principle in the fear of Heaven. If this sinner, however, is not God-fearing, such as one who cast from himself the yoke of the Kingdom of Heaven, and does not keep himself from one transgression which all the people of this town know to be a transgression, then it is a mitzvah to speak disparagingly of him and to reveal his sins and to demean transgressors in the eyes of men so that they hear and despise him and keep themselves far from transgression, as it is written (Mishlei 29:27): "The abomination of the righteous is a man of wrong," and (ibid. 8:13): "The fear of Hashem is to hate evil."