Musnad Ahmad 25:902

Hassan ibn Musa narrated to us, Abu 'Awanah narrated to us, from Simak ibn Harb, from 'Ikrimah, from Ibn 'Abbas, that a Bedouin came to the Prophet, may Allah bless him and grant him peace, and spoke with clear speech. The Prophet, may Allah bless him and grant him peace, said: "Indeed, some eloquence is magic, and indeed, some poetry is wisdom."