Explanation

As the Prophet (may Allah's peace and blessings be upon him) was on one of his journeys, and the people were in their sleeping places where they would pass the night in their dwellings and tents, he sent someone to the people ordering them to cut the necklaces hung around the camels' necks, be they made of strings - bowstrings - or any other material, like bells or sandals. This is because they used to hang these necklaces for protection against the evil eye. Hence, they were ordered to cut them, as they are of no avail against the evil eye, and benefit and harm lie in the Hand of Allah alone, with no partner.