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'Umar ibn Abi Salama said that he went in to see Allah’s Messenger (Allah bless him and give him peace), who had a meal before him, so he said to him: 'O my dear son, pronounce the Name of Allah(Exalted is He), eat with your right hand, and eat what is directly in front of you!’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ اللهِ بْنُ الصَّبَّاحِ الْهَاشِمِيُّ الْبَصْرِيُّ، قَالَ: حَدَّثَنَا عَبْدُ الأَعْلَى، عَنْ مَعْمَرٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ، أَنَّهُ دَخَلَ عَلَى رَسُولِ اللهِ صلى الله عليه وسلم، وَعِنْدَهُ طَعَامٌ، فَقَالَ: ادْنُ يَا بُنَيَّ، فَسَمِّ اللَّهَ تَعَالَى، وَكُلْ بِيَمِينِكَ، وَكُلْ مِمَّا يَلِيكَ.
sunnah.com