Musnad Abu Ya'la al-Mawsili 110:255

Zuhayr narrated to us, Hisham ibn Abd al-Malik narrated to us, Abu 'Awanah narrated to us, from Simak, from 'Ikrimah, from Ibn 'Abbas, who said: A Bedouin came to the Messenger of Allah, may Allah bless him and grant him peace, and began to speak with eloquent speech. The Messenger of Allah, may Allah bless him and grant him peace, said: "Indeed, some eloquence is magic, and indeed, some poetry is wisdom."