Musannaf Ibn Abi Shayba 16:210

Abu Bakr narrated to us, he said: Marwan bin Mu'awiyah narrated to us, from 'Abd al-Malik, from 'Ubayd bin Sulayman, from al-Dahhak bin Muzahim, from Ibn 'Abbas, he said: "Do not eat with your left hands, for Adam ate with his left hand and forgot, and that forgetfulness was inherited by him."