Abu Bakr ibn Abi Shaybah, 'Amr al-Naqid, and Zuhayr ibn Harb narrated to us. They said: Sufyan ibn 'Uyaynah narrated to us, from Abu al-Zinad, from al-A'raj, from Abu Hurayrah, may Allah be pleased with him. Abu Bakr ibn Abi Shaybah narrated it as a report (riwayah), 'Amr said: "reaching the Prophet, peace and blessings be upon him," and Zuhayr said: "from the Prophet, peace and blessings be upon him," who said: "When one of you is invited to food while he is fasting, let him say: 'I am fasting.'"