"The Messenger of Allah said: The one who does not pay Zakah on his wealth, his wealth will appear to him on the Day of Resurrection like a bald-headed Shuja 'a with two dots above its eyes. It will hold onto him or encircle him and will say: I am your hoarded treasure, I am your hoarded treasure."'
Sunan an-Nasa'i Book 23, Hadith 47