Full Sharh — Riyad as-Salihin 52
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" . ((رواه أبو داود والنسائي))
English Translation
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.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book About the Etiquette of Eating
Hadith Number
52