Narrated to us Abu Bakr ibn Abi Shaybah, narrated to us 'Ali ibn Mushir, from 'Ubaydullah; and narrated to us Muhammad ibn 'Abdullah ibn Numayr — and the wording is his — narrated to us my father, narrated to us 'Ubaydullah, from Nafi', from Ibn 'Umar, that the Messenger of Allah (peace and blessings be upon him) said: "Whoever buys food, let him not sell it until he has taken full possession of it."