وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي نُعَيْمٍ، وَهْبِ بْنِ كَيْسَانَ قَالَ أُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِطَعَامٍ وَمَعَهُ رَبِيبُهُ عُمَرُ بْنُ أَبِي سَلَمَةَ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ سَمِّ اللَّهَ وَكُلْ مِمَّا يَلِيكَ ‏"‏ ‏.‏

Yahya related to me from Malik from Abu Nuaym that Wahb ibnKaysan said, "The Messenger of Allah, may Allah bless him and granthim peace, was brought food while his stepson Umar ibn Salama was withhim. The Messenger of Allah, may Allah bless him and grant him peace,said to him, 'Say "Bismillah," and eat what is in front of you.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 49 Hadith 1706
Web Ref:  Muwatta Imam Malik Book 49 Hadith 32