Shama-il Tirmidhi Chapter 027, Hadith Number 006 (184).
Aayeshah Radiyallahu 'Anha relates that while Rasulullah Saliallahu aIayhi Wasallam and six of the Sahaabah were having meals, a badawi came. He ate all the food up in two bites. Rasulullah Sallallahu 'Alayhi Wasallam said: "If he had read 'Bismillah' it should have been sufficient for all."
Because the badawi did not recite Bismillah, the shaytaan joined and finished everything. The barakah of the food vanished.