Musnad Abu Ya'la al-Mawsili 2:68

'Abdullah ibn Aban al-Kufi narrated to us, 'Abdah ibn Sulayman narrated to us, from 'Ubaydullah ibn 'Umar, from al-Zuhri, from Abu Bakr ibn 'Ubaydullah, from Ibn 'Umar, from 'Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Let not one of you eat with his left hand, for indeed the devil eats with his left hand and drinks with his left hand."