Hilchos Lashon Hara chapter 10, section 15

We see that when relying on this leniency, a person is in great danger of speaking lashon hara if he does not keep all the details, especially numbers 2 and 4.

About this it says: "Life and death are in the hand of the tongue" (Mishlei 18:21).

If you do not think carefully before speaking, you will surely stumble. While talking, a person gets carried away by anger, and then he cannot hold himself back.

So you must plan what to say before you speak.