Malik related to me from Zayd ibn Aslam that Abdullah ibn Umarsaid, "Two men from the east stood up and spoke, and people wereamazed at their eloquence. The Messenger of Allah, may Allah bless himand grant him peace, said, 'Some eloquence is sorcery,' or he said,'Part of eloquence is sorcery.' "
USC-MSA web (English) reference: Book 56, Hadith 7
Arabic reference: Book 56, Hadith 1820