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."  

أَنَّهُ دَخَلَ عَلَى رَسُولِ اللَّهِ ﷺ وَعِنْدَهُ طَعَامٌ فَقَالَ ادْنُ يَا بُنَىَّ وَسَمِّ اللَّهَ وَكُلْ بِيَمِينِكَ وَكُلْ مِمَّا يَلِيكَ  

From 'Aishah that the Messenger of Allah ﷺ said: "When one of you eats food, then let him say: 'Bismillah.' If he forgets in the beginning, then let him say: 'Bismillah Fi Awwalihi Wa Akhirih (In the Name of Allah in its beginning and its end.)"  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَكَلَ أَحَدُكُمْ طَعَامًا فَلْيَقُلْ بِسْمِ اللَّهِ فَإِنْ نَسِيَ فِي أَوَّلِهِ فَلْيَقُلْ بِسْمِ اللَّهِ فِي أَوَّلِهِ وَآخِرِهِ  

"The Prophet ﷺ was eating food with six of his Companions. A Bedouin came and ate it in two mouthfuls. So the Messenger of Allah ﷺ said: "As for him, had he mentioned (Allah's Name), it would have been enough for all of you."  

كَانَ النَّبِيُّ ﷺ يَأْكُلُ طَعَامًا فِي سِتَّةٍ مِنْ أَصْحَابِهِ فَجَاءَ أَعْرَابِيٌّ فَأَكَلَهُ بِلُقْمَتَيْنِ فَقَالَ رَسُولُ اللَّهِ ﷺ أَمَا إِنَّهُ لَوْ سَمَّى لَكَفَاكُمْ