Jami` at-Tirmidhi, Volume 3, Book 23, Hadith 1858 (DarusSalam) ⓘ

Narrated Umm Kulthum: From 'Aishah that the Messenger of Allah 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.)"

حَدَّثَنَا أَبُو بَكْرٍ، مُحَمَّدُ بْنُ أَبَانَ حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا هِشَامٌ الدَّسْتَوَائِيُّ، عَنْ بُدَيْلِ بْنِ مَيْسَرَةَ الْعُقَيْلِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عُبَيْدِ بْنِ عُمَيْرٍ، عَنْ أُمِّ كُلْثُومٍ، عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ إِذَا أَكَلَ أَحَدُكُمْ طَعَامًا فَلْيَقُلْ بِسْمِ اللَّهِ فَإِنْ نَسِيَ فِي أَوَّلِهِ فَلْيَقُلْ بِسْمِ اللَّهِ فِي أَوَّلِهِ وَآخِرِهِ ‏" ‏ ‏.‏

It is narrated with this chain of narration, from 'Aishah who said: "The Prophet was eating food with six of his Companions. A Bedouin came and ate it in two mouthfuls. So the Messenger of Allah said: "As for him, had he mentioned (Allah's Name), it would have been enough for all of you." [Abu 'Eisa said:] This Hadith is Hasan Sahih. Umm Kulthum is the daughter of Muhammad bin Abi Bakr As-Siddiq, may Allah be pleased with them.

وَبِهَذَا الإِسْنَادِ عَنْ عَائِشَةَ، قَالَتْ كَانَ النَّبِيُّ صلى الله عليه وسلم يَأْكُلُ طَعَامًا فِي سِتَّةٍ مِنْ أَصْحَابِهِ فَجَاءَ أَعْرَابِيٌّ فَأَكَلَهُ بِلُقْمَتَيْنِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ أَمَا إِنَّهُ لَوْ سَمَّى لَكَفَاكُمْ ‏" ‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏ وَأُمُّ كُلْثُومٍ هِيَ بِنْتُ مُحَمَّدِ بْنِ أَبِي بَكْرٍ الصِّدِّيقِ رَضِيَ اللَّهُ عَنْهُ ‏.‏