Imam Al-Nawawi’s Riyad-us-Saliheen
Eating from what is in front of One
740. `Umar bin Abu Salamah (May Allah be pleased with them) reported: I was a boy under the care of Messenger of Allah (sallallaahu alayhi wa sallam), and as my hand used to wander around in the dish, he (sallallaahu alayhi wa sallam) said to me once, “Mention Allah’s Name (i.e., say Bismillah), eat with your right hand, and eat from what is in front of you.”
[Al-Bukhari and Muslim].
741. Salamah bin Al-Akwa` (May Allah be pleased with him) reported on the authority of his father: A man ate with his left hand in the presence of Messenger of Allah (sallallaahu alayhi wa sallam), whereupon he said, “Eat with your right hand.” The man said: “I cannot do that.” Thereupon he (the Prophet (sallallaahu alayhi wa sallam)) said, “May you not be able to do that.” It was vanity that prevented him from doing it and he could not raise it (the right hand) up to his mouth afterwards.