Musnad Ahmad 25:117

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Abu Dhabyan, from Ibn Abbas, who said: A man from Banu Amir came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, show me the seal that is between your shoulder blades, for I am among the most skilled of people in medicine." The Messenger of Allah, may Allah bless him and grant him peace, said to him: "Shall I not show you a sign?" He said: "Yes." He said: "He looked at a palm tree and said: 'Call that cluster of dates.'" He said: "So he called it, and it came leaping until it stood before him." Then the Messenger of Allah, may Allah bless him and grant him peace, said to it: "Return." So it returned to its place. The Amiri said: "O family of Banu Amir, I have never seen a man more of a sorcerer than I have today."