Jami` at-Tirmidhi 1956

Abu Dharr narrated that the Messenger of Allah said :"Your smiling in the face of your brother is charity, commanding good and forbidding evil is charity, your giving directions to a man lost in the land is charity for you. Your seeing for a man with bad sight is a charity for you, your removal of a rock, a thorn or a bone from the road is charity for you. Your pouring what remains from your bucket into the bucket of your brother is charity for you