Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sells food, let him not sell it until he has taken full possession of it."
Imam al-Tabarani (may Allah have mercy on him) said: Qabisah narrated it thus from Hammad bin Salamah, from Amr, from Ata, whereas the other students of Hammad narrated it from Hammad, from Amr, from Tawus; the students of Amr bin Dinar also narrated it in this way, and that is correct.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11344