The Prophet ﷺ said, "Whoever buys food must not sell it until he has taken full possession of it."
حدثنا عبد الرحمن عن مالك عن نافع
عن النبي ﷺ قال من ابتاع طعاما فلا يبيعه حتى يستوفيه
Its isnad is sahih, and it is a repeat of 5064. See also 5148.