Messenger of Allah (peace & blessings of Allah be upon him) said:
“Your smiling in the face of your brother is charity;
Enjoining the good & forbidding the evil is charity;
Your guiding a man that has lost his way is charity; and
Your removing of stones, thorns, and bones from people’s paths is charity for you.”
[Tirmidhi Book of Birr (Piety) Hadith#36]