Yahya related to me from Malik from Abdullah ibn Abi Bakr from Abbad ibn Tamim that Abu Bashir al-Ansari told him that he was with the Messenger of Allah (ﷺ) on one of his journeys. He related, "The Messenger of Allah (ﷺ) sent a messenger." (Abdullah ibn Abi Bakr said, (I think that he said it was while the people were in their resting place.) He said, "Do not let a single-string necklace, or any necklace, remain unbroken on the neck of a camel."
Yahya said, "I heard Malik say, 'I think that was because of the evil eye.' ''