Sunan Abi Dawud Book 15, Hadith 76

Abu Bashir Al Ansari said that he was with the Apostle of Allaah(ﷺ) on one of his journeys. The Apostle of Allaah(ﷺ)sent a messenger. The narrator ‘Abd Allah bin Abu Bakr said “I think he said while the people were sleeping. No necklace of bowstring or anything else must be left on a Camels’ neck, must be cut off. The narrator Malik said “I think this was due to evil eye.”