11. One whose friend has already made a purchase in which he was cheated, if according to Torah law, he may not bring a claim against the merchant, one is forbidden to tell the client that he has been cheated. If he is permitted to bring a claim against the merchant, one is permitted to tell him, on the following conditions:

12. A. He must not exaggerate. B. His intention is for a constructive purpose and he is sure that his getting involved will be effective. C. He is not able to convince the merchant to pay back the difference in price, without first telling the client. D. There is no other way to effect a solution. G. If it is the way of the client to speak rechilus and he will tell the merchant who told him that he’s been cheated, it is questionable whether he is permitted to tell him. If it seems, that he will listen to the speaker’s request not to tell the merchant, it is permitted.