Included in the prohibition against speaking rechilus is relating information which might ultimately cause ill will if it were to be passed on to a certain person or persons.
Therefore, it is forbidden to say anything to anyone that might cause animosity between any two people. One must assume that whatever is told to even one person is likely to be repeated to others – and could ultimately be heard by just about anybody. Only if the listener is warned not to tell anyone what he is about to hear, and can be trusted to heed this warning, would it be permitted to share such information with him (provided, of course, that the information is not of a derogatory nature; otherwise, it would be loshon hora).
