On eating from in front of one and instructing someone who eats badly

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

104. Chapter: On eating from in front of one and instructing someone who eats badly

740. 'Amr ibn Salama said, "I was a boy in the care of the Messenger of Allah, may Allah bless him and grant him peace, and my hand used to go all around in the plate. The Messenger of Allah, may Allah bless him and grant him peace, said to me, 'Boy, say the name of Allah and eat with your right hand and eat from what is in front of you.'" [Agreed upon]

741. Salama ibn 'Amr ibn al-Akwa' related that a man ate with the Messenger of Allah, may Allah bless him and grant him peace, using his left hand, and he said, "Eat with your right hand." He said, "I cannot." He said, "Then you cannot." Only pride had stopped him and he could not raise it to his mouth. [Muslim]