The Messenger of Allah ﷺ said, "Whoever buys food must not sell it until he has taken full possession of it."
حدثنا ابن نمير حدثنا عبيد الله عن نافع
أن رسول الله ﷺ قال من اشترى طعاما فلا يبعه حتى يستوفيه
Its isnad is sahih. Abu Dawud 3:399 narrated it via Malik from Nafi. Munziri said, Bukhari, Muslim, Nasai, and Ibn Majah also narrated it. See 4716.