From the morals and manners of the Salaf was they would conceal the secrets of the people. They would say, “The hearts of the free are graves full of secrets.“
Nameemah (carrying tales) is to spread or relay to a third party or others some words which cause harm to the one from whom the words were initially heard. It is also defined as: Uncovering what is disliked to be uncovered. The Messenger of Allaah (sallAllaahu alaihi wa sallam) said, “The Qattaat will not enter Paradise“  i.e., the one who practiced nameemah. It is also reported concerning the explanation (tafseer) of the statement of Allaah “And his woman a carrier of firewood”  that she would practice nameemah and spread gossip.
Yahya ibn Abee Katheer (rahimahullaah) would say, “The one who does nameemah is worse than the magician even though no one realizes. What the one who gossips can do in a period of time a sorcerer cannot do in a month. Gossip has spilled blood and given rise to great tribulation expelling people from their countries and other evil things.”
Khaalid ibn Safraan (rahimahullaah) said, “Despise the one who gossips even if he speaks the truth. Nameemah is relating (tales) and accepting this is recommending the narrator. The acceptance is then worse than the nameemah.”
Know this O brother and beware of exposing the secrets of your brothers or relating to others what you hear from them. All praise be to Allaah the Lord of the worlds.