Sahih al-Bukhari 5357

Muhammad ibn Salam narrated to me: Wakiʿ informed us, from Ibn ʿUyaynah, who said: Maʿmar told me that al-Thawri had asked whether he had heard anything about a man storing provisions for his family for a year or part of a year. Maʿmar said, “I could not recall anything at the time.” Then he remembered a report narrated to them by Ibn Shihab al-Zuhri, from Malik ibn Aws, from ʿUmar, may God be pleased with him: The Prophet, peace and blessings be upon him, used to sell the date palms of Banu al-Nadir and set aside provisions for his family for a year.