Muwatta Malik 597
موطأ مالك#597SahihYahya related to me from Malik that Abdullah ibn Dinar said, "I heard Abdullah ibn Umar being asked what kanz was and he said, 'It is wealth on which zakat has not been paid
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 17:20