Ibn Mas'ud reported the Prophet as saying,
“No man will fail to pay the zakat on his property without God putting a large snake on his neck on the day of resurrection." He then recited to them the justification of it from God s Book, “Let not those who are niggardly with what God has given them from His bounty suppose…”*
Tirmidhi, Nasa’i and Ibn Majah transmitted it.
* Quran 3:180.