Musnad Ahmad 30:2854

'Abd al-Rahman narrated to us, he said: Hammad narrated to us, from 'Ammar, he said: I heard Abu Hurayrah narrating from the Prophet, peace and blessings of Allah be upon him, he said: "When the servant of one of you brings his food, having been sufficient against its heat and its labor, let him seat him to eat with him, or let him hand him a morsel."