It was narrated that Ibn "Abbas said:

A man from Banu ‘Amir came to the Prophet (ﷺ) and said: O Messenger of Allah, show me the Seal that is between your shoulders, for I know the most about medical matters. The Messenger of Allah (ﷺ) said to him: "Shall I not show you a sign?" He said: Yes. He looked at a palm tree and said: "Call this bunch of dates." So he called it, and it came jumping until it stopped in front of him. Then the Messenger of Allah (ﷺ) said to it: "Go back," and it went back to its place. The "Amiri man said: O Banu "Amir, I have never seen any man more skilled in magic than I have seen today.