Narrated to us Abu Bakr ibn Abi Shaybah, and 'Amr al-Naqid, and Ishaq ibn Ibrahim, and Ibn Abi 'Umar — Ishaq said: "informed us," while the others said: "narrated to us" — Sufyan, from 'Amr, from 'Ata', from Ibn 'Abbas, who said: The Messenger of Allah, peace and blessings be upon him, said: "When one of you eats food, let him not wipe his hand until he has licked it or had it licked."