The Prophet (sallallahu alayhi wa sallam) said:
“It is also charity to utter a good word.”
[Al-Bukhari and Muslim]
In Islam, it is not spending money alone that counts as charity; talking to somebody in a decent way also comes in the same context. Now, one can feel the importance Islam gives to moral values and good manners.
Riyad-us-Saliheen – Hadith No: 694