That he entered upon the Messenger of Allah ﷺ while he has some food. He said: "Sit down O my son! Mention Allah's Name and eat with your right hand, and eat what is nearest to you." (Using translation from Tirmidhī 1857)   

أَنَّهُ دَخَلَ عَلَى رَسُولِ اللهِ ﷺ وَعِنْدَهُ طَعَامٌ فَقَالَ «ادْنُهْ يَا بُنَيَّ فَسَمِّ اللهَ وَكُلْ بِيَمِينِكَ وَكُلْ مِمَّا يَلِيكَ» خَالَفَهُ خَالِدُ بْنُ الْحَارِثِ  

[Machine] He came one day and sat in front of the Messenger of Allah ﷺ and he said to him, "Sit, my son, and say 'Bismillah' (in the name of Allah), and eat with your right hand, and eat from what is in front of you." Abu 'Abd al-Rahman said, "This is the correct way according to us, and Allah knows best, and success is from Allah."  

أَنَّهُ جَاءَ يَوْمًا وَبَيْنَ يَدَيْ رَسُولِ اللهِ ﷺ فَقَالَ لَهُ «اجْلِسْ بُنَيَّ فَسَمِّ اللهَ وَكُلْ بِيَمِينِكَ وَكُلْ مِمَّا يَلِيكَ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ وَهَذَا الصَّوَابُ عِنْدَنَا وَاللهُ أَعْلَمُ وَبِاللهِ التَّوْفِيقُ