How to politely scold someone who gossips in the circle of friends

The following is a text to euphemistically scold someone who gossips in the circle of friends:

1. You can give me some advice, but please don’t point fingers or gossip behind my back!

2. Be sure to remember, don’t talk about her again in the future, just teach everyone a lesson and unite, don’t talk nonsense, talk less, just study quietly!

3. I believe that the people on this side will be fired soon, while he and the people on the other side are a bunch of kitsch people talking nonsense.

4. I can’t understand that those who used to gossip behind my back have turned into close friends.

5. The world is so wonderful! Some people can always repeat things that others have known for a long time as if they are new news.