Hadith on sadaqah;

"There is a (compulsory) sadaqah (charity) to be given for every joint of the human body (as a sign of gratitude to Allah) every day the sun rises. To judge justly between two persons is regarded as sadaqah; and to help a man concerning his riding animal, by helping him to mount it or by lifting his luggage on to it, is also regarded as sadaqah; and (saying) a good word is also sadaqah; and every step taken on one's way to offer the compulsory prayer (in the mosque) is also sadaqah; and to remove a harmful thing from the way is also sadaqah."