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 Quran's verses: 'Let not those who withhold . . .' (to the end of the verse 3.180)

Sahih Al Bukhari Vol 2 Number 486