Musnad Ahmad 304:3

Abu Mu'awiyah narrated to us, he said: Hisham ibn 'Urwah narrated to us, from Abu Wajzah, a man from Banu Sa'd, from a man from Muzaynah, from 'Umar ibn Abi Salamah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "O my son, when you eat, mention the name of Allah, eat with your right hand, and eat from what is in front of you." He said: So that has continued to be my way of eating ever since.