Sahih al-Bukhari, Hadith 5378 ⓘ
Narrated Wahb bin Kaisan Abi Nu'aim: A meal was brought to Allah's Messenger while his step-son, `Umar bin Abi Salama was with him. Allah's Messenger said to him, "Mention the Name of Allah and eat of the dish what is nearer to you."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ وَهْبِ بْنِ كَيْسَانَ أَبِي نُعَيْمٍ، قَالَ أُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِطَعَامٍ وَمَعَهُ رَبِيبُهُ عُمَرُ بْنُ أَبِي سَلَمَةَ فَقَالَ " سَمِّ اللَّهَ، وَكُلْ مِمَّا يَلِيكَ " .
also referenced under: Book 70, Hadith 6 (In-Book) & Volume 7, Book 65, Hadith 290 (USC-MSA)