Yahya related to me from Malik from Abdullah ibn Abi Bakr thathis grandfather, Muhammad ibn Amr ibn Hazm sold the fruit of anorchard of his called al-Afraq, for 4,000 dirhams, and he kept aside800 dirhams' worth of dry dates.
USC-MSA web (English) reference: Book 31, Hadith 18
Arabic reference: Book 31, Hadith 1311