Narrated Umer bin Abi Salama(R.A):
I was boy under the care of Allah's Apostle(R.A) and my hand used to go around the dish while I was eating.
So Allah's Apostle(Salla Allahu Alyhe Wa Aalihe Wassalam ) said to me,
"O boy! mention the Name of Allah and eat with your right hand, and eat of the dish which is nearer to you.' Since than I have applied those instructions when eating."
Book :65 (Food, Meals)