Assalamu alaikum wa rahmatullahi wa barakatuhu!
In the Name of Allah, Most Gracious, Most Merciful
When someone asked the reason, the Prophet (s) said, “When a person commits adultery, and repents to Allah, Allah will forgive him. However, if he perpetrates backbiting, he will not be forgiven until he is first forgiven by the person against whom he had spoken ill of.”
If they don’t find out, then you have to seek forgiveness FOR them from Allah until your heart is content that you have made up the wrong of backbiting.
The Prophet (s) then recited the verse: Assisting the Mumineen is a binding duty upon us.
mimicking a person.