Sahih Muslim , Book 36, Hadith 143 (In-Book) ⓘ
'Umar b. Abu Salama reported: I was under the care of Allah's Messenger (way peace be upon him), and as my hand used to roam about in the dish he said to me: Boy, mention the name of Allah, and eat with your right hand and eat from what is near to you.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَابْنُ أَبِي عُمَرَ، جَمِيعًا عَنْ سُفْيَانَ، قَالَ أَبُو بَكْرٍ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الْوَلِيدِ بْنِ كَثِيرٍ، عَنْ وَهْبِ بْنِ كَيْسَانَ، سَمِعَهُ مِنْ، عُمَرَ بْنِ أَبِي سَلَمَةَ قَالَ كُنْتُ فِي حَجْرِ رَسُولِ اللَّهِ صلى الله عليه وسلم وَكَانَتْ يَدِي تَطِيشُ فِي الصَّحْفَةِ فَقَالَ لِي " يَا غُلاَمُ سَمِّ اللَّهَ وَكُلْ بِيَمِينِكَ وَكُلْ مِمَّا يَلِيكَ " .
also referenced under: Hadith 2022 (Reference) & Book 23, Hadith 5012 (USC-MSA)