Narrated Abu Huraira: The Prophet said, "Charity is obligatory everyday on every joint of a human being. If one helps a person in matters concerning his riding animal by helping him to ride it or by lifting his luggage on to it, all this will be regarded charity. A good word, and every step one takes to offer the compulsory Congregational prayer, is regarded as charity; and guiding somebody on the road is regarded as charity."
[Hadith from Sahih Bukhari, Book No. 52: Fighting for the Cause of Allah (Jihaad), Hadith No. 141]