Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 5222
Narated By Buraydah ibn al-Hasib : I heard the Apostle of Allah (pbuh) say: A human being has three hundred and sixty joints for each of which he must give alms. The people asked him: Who is capable of doing this ? He replied: It may be mucus in the mosque which you bury, and something which you remove from the road; but if you do not find such, two rak'ahs in the forenoon will be sufficient for you.