Sahih Bukhari Volume 002, Book 024, Hadith Number 486.

Narated By Abu Huraira : Allah's Apostle said, "Whoever is made wealthy by Allah and does not pay the Zakat of his wealth, then on the Day of Resurrection his wealth will be made like a bald-headed poisonous male snake with two black spots over the eyes. The snake will encircle his neck and bite his cheeks and say, 'I am your wealth, I am your treasure.' " Then the Prophet recited the holy verses: 'Let not those who withhold...' (to the end of the verse). (3.180).