Abu Dawud
Zakat
Book Number: 003 / Hadith Number: 1558
Narated By Umm Salamah, Ummul Mu'minin : I used to wear gold ornaments. I asked: Is that a treasure (kanz), Apostle of Allah? He replied: whatever reaches a quantity on which zakat is payable is not a treasure (kanz) when the zakat is paid.