Abu Dawud Book 36, Hadith Number 5222.
Chapter : Not known.
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.