مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2794
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that the Messenger of Allah (ﷺ) said: "Some poetry is wisdom and some eloquence is magic."
Musnad Ahmad 2814Saheeh because of corroborating evidence]