I used to wear gold ornaments. I asked: Is that a treasure (kanz), Messenger of Allah? He replied: whatever reaches a quantity on which zakat is payable is not a treasure (kanz) when the zakat is paid.
Sunan Abi Dawud Book 9, Hadith 9
← Previous Hadith A woman came to the Messenger of Allah (ﷺ) and she was accompanied by her daughter who wore two heavy gold bangles in her hands. He said to her: Do you pay zakat on them? She said: No. He then said: Are you pleased that Allah may put two bangles of fire on your hands?

Thereupon she took them off and placed them before the Prophet (ﷺ) saying: They are for Allah and His Apostle.

Sunan Abi Dawud Book 9, Hadith 8 Next Hadith → We entered upon A’ishah, wife of the Prophet (ﷺ). She said The Apostle of Allaah (ﷺ) entered upon me and saw two silver rings in my hand. He asked What is this, Aishah? I said I have made two ornaments myself for you, Messenger of Allah (ﷺ). He asked Do you pay zakat on them? I said No or I said Whatever Allah willed. He said this is sufficient for you (to take you) to the Hell fire.

Sunan Abi Dawud Book 9, Hadith 10