Musannaf Ibn Abi Shayba 17:1254

Waki’ narrated to us, from Hisham, from Abu Wajzah al-Sa’di, from a man from Muzaynah, from ‘Umar ibn Abi Salamah, that food was brought to the Prophet, may Allah bless him and grant him peace. He said: "O ‘Umar, O my son, mention the name of Allah, eat with your right hand, and eat from what is in front of you."