Abu Dawud Book 21, Hadith Number 3759.
Chapter : Not known.
Narated By Umayyah ibn Makhshi : Umayyah was sitting and a man was eating. He did not mention Allah’s name until there remained the last morsel. When he raised it to his mouth, he said: In the name of Allah at the beginning and at the end of it. The Prophet (PBUH) laughed and said: The devil kept eating along with him, but when he mentioned Allah’s name, he vomited what was in his belly.