SHAFAQNA – A man came to Imam Hassan (AS) and said: Such a person talks bad about you behind your back. Imam Hassan (AS) frowned and said: You put me in trouble, now that I heard the gossip about a Muslim person, I must repent (to God), and as you mentioned that person committed sin by talking behind my back, I must also pray for him as well [1].
[1] Beharul Anwaar, Vol. 43, Page 350.