Mishkat al-Masabih 5904 — Excellent Qualities and Description of the Prophet

Salama b. al-Akwa` told that when a man ate with his left hand in the presence of God's messenger he said, " Eat with your right hand." On his replying, "I am not able," he said, "May you not be able!" for it was simply pride which prevented him. He told that he did not raise it[*] to his mouth [after that]. *i.e., his right hand. Muslim transmitted it.