Mother of the Believers, Aisha (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) said: "When any of you eats food, he should recite «بسم اللہ», and if he forgets at the beginning, he should say «بسم الله في أوله وآخره»."
Hadith Referenceسنن ترمذي / كتاب الأطعمة عن رسول الله صلى الله عليه وسلم / 1858
Hadith Gradingالألبانی:**
Hadith Takhrij«سنن ابی داود/ الأطعمة 16 (3767) ، سنن النسائی/عمل الیوم واللیلة 103 (281) ، سنن ابن ماجہ/الأطعمة 7 (3264) ، والمؤلف في الشمائل25 ( تحفة الأشراف : 17988) ، و مسند احمد (6/143) ، سنن الدارمی/الأطعمة 1 (2063) (صحیح)»
´It was narrated that ‘Aishah said:` “The Messenger of Allah (ﷺ) was eating food with six of his Companions when a Bedouin came and ate it all in two bites. The Messenger of Allah (ﷺ) said: ‘If he had said Bismillah, it would have sufficed you (all). When any one of you eats food, let him say Bismillah, and if he forgets to say Bismillah at the beginning, let him say Bismillah fi awwalihi wa akhirih (In the Name of Allah at the beginning and at the end).’”
Maulana Ataullah Sajid
Benefits and Issues:
➊ Saying "Bismillah" brings blessing (barakah) to the food, and a small amount of food becomes sufficient for many people.
➋ If several people are eating together from one dish, all of them should say "Bismillah." If even one person begins eating without saying "Bismillah," the blessing is removed.
➌ At the start of eating, one should say "Bismillah." If one forgets at the beginning, then upon remembering, one should say: "Bismillah awwalahu wa akhirahu" or "Bismillah fi awwalihi wa akhirihi."
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 3264