ENOfficial
Ibn 'Abbas said that a man - or a bedouin - came to the Prophet, may Allah bless him and grant him peace, and spoke some eloquent words. The Prophet, may Allah bless him and grant him peace, said, "There is some magic eloquence and some wisdom in poetry."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَارِمٌ، قَالَ: حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ سِمَاكٍ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَجُلاً، أَوْ أَعْرَابِيًّا، أَتَى النَّبِيَّ صلى الله عليه وسلم فَتَكَلَّمَ بِكَلاَمٍ بَيِّنٍ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم: إِنَّ مِنَ الْبَيَانِ سِحْرًا، وَإِنَّ مِنَ الشِّعْرِ حِكْمَةً.
sunnah.com