Sahih al-Bukhari Book 70, Hadith 5
Who was the son of Um Salama, the wife of the Prophet:
Once I ate a meal with Allah's Messenger (ﷺ) and I was eating from all sides of the dish. So Allah's Messenger (ﷺ)
said to me, "Eat of the dish what is nearer to you."
I was a boy under the care of Allah's Messenger (ﷺ) and my hand used to go around the dish while I was eating. So Allah's Messenger (ﷺ) said to me, 'O boy! Mention the Name of Allah and eat with your right hand, and eat of the dish what is nearer to you." Since then I have applied those instructions when eating.
A meal was brought to Allah's Messenger (ﷺ) while his step-son, `Umar bin Abi Salama was with him. Allah's Messenger (ﷺ) said to him, "Mention the Name of Allah and eat of the dish what is nearer to you."