Musnad Abu Ya'la al-Mawsili 107:26

Abu Khaythama narrated to us, Abu 'Asim al-Dahhak ibn Makhlad narrated to us, from Haywah ibn Shurayh, from Khalid ibn 'Ubayd, from Musharrah, from 'Uqbah ibn 'Amir al-Juhani, from the Prophet, may Allah bless him and grant him peace, who said: "Whoever hangs an amulet, may Allah not complete [his affairs] for him, and whoever hangs a seashell, may Allah not grant him tranquility."