Musnad Abu Ya'la al-Mawsili 110:5

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