Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "The Kanz (money, the Zakat of which is not paid) of anyone of you will appear in the form of bald-headed poisonous male snake on the Day of Resurrection." (PT)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 182 (PT)
Arabic reference (PT): Book 65, Hadith 4659 (PT)