Hadith 670
It is narrated from Abdullah bin Dinar that he heard from Sayyiduna Abdullah bin Umar (may Allah be pleased with them), someone asked: What is Kanz (hoarded wealth)? He replied: Kanz is the wealth on which zakat is not given.
Hadith 671
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), he used to say: Whoever possesses wealth and does not pay its zakat, then on the Day of Resurrection that wealth will take the form of a bald snake with two black spots over its eyes, and it will search for its owner until it finds him. Then it will say to him: I am your wealth, the zakat of which you did not pay.