Umaiyyah bin Makhshi (May Allah be pleased with him) reported:
Messenger of Allah ﷺ was sitting while a man was eating food. That man did not mention the Name of Allah (before commencing to eat) till only a morsel of food was left. When he raised it to his mouth, he said: "Bismillah awwalahu wa akhirahu (With the Name of Allah, in the beginning and in the end)." Messenger of Allah ﷺ smiled at this and said, "Satan had been eating with him but when he mentioned the Name of Allah, Satan vomited all that was in his stomach."
[Abu Dawud and An-Nasa'i].
وعن أمية بن مخشى الصحابي رضى الله عنه قال: كان رسول الله صلى الله عليه وسلم جالساً ، ورجل يأكل، فلم يسم الله حتى لم يبق من طعامه إلا لقمة، فلما رفعها إلى فيه، قال: بسم الله أوله وآخره، فضحك النبي صلى الله عليه وسلم، ثم قال:
"ما زال الشيطان يأكل معه، فلما ذكر اسم الله استقاء ما فيه بطنه" . .