On the authority of ‘Uqbah Ibn Aamir that the Messenger of Allah (صلى الله عليه و سلم) met some people. Then he let 9 of them pledge allegiance to him and left out one of them. It was then said: Oh Messenger of Allah you let 9 of them pledge allegiance to you and you left out that one. He (صلى الله عليه و سلم) then said: “He has an amulet.” He therefore entered his hand and cut it and then let the man pledge allegiance to him and he said: “Whoever wears an amulet has made Shirk.”
Narrated by Imam Ahmad in his Musnad. And it has been graded Hasan by Ash Shaikh Muqbil.