Maliks Muwatta Book 31, Hadith Number 18.

Section : What is Permissible in Keeping Back a Portion of the Fruit.

Yahya related to me from Malik from Abdullah ibn Abi Bakr that his grandfather, Muhammad ibn Amr ibn Hazm sold the fruit of an orchard of his called al-Afraq, for 4,000 dirhams, and he kept aside 800 dirhams’ worth of dry dates.